The AI IPO tsunami on the stock market has only recently gotten under way, with SpaceX’s more-than-$2 trillion IPO likely to be followed in several months by OpenAI’s and Anthropic’s IPOs — each of which is likely to hit $1 trillion.

That will mint three new trillion-dollar AI companies in a matter of months, all of which compete with Microsoft. 

Wall Street has never seen anything like it. Previously, the most money raised by all IPOs in a single year was $671 billion in 2021. It took 38,644 deals to get to that figure. Compare that to three deals this year that by themselves will likely total $4 trillion.

The numbers are eye-popping. 

For Microsoft though, it’s not the numbers themselves that are important. It’s what will happen to the company once it as three newly minted trillion-dollar AI competitors. Until recently, when it came to AI, Microsoft was king of the hill. But can it keep that place?

Microsoft’s weakened position

The IPOs come at a particularly fraught time for Microsoft. At one point, it was the most valuable AI company in the world, with a big head start on the tech industry.

No longer. Microsoft’s stock price has tanked in the past 12 months, even as the S&P index has soared. In the last year, Microsoft’s stock price has dropped 24%, while the S&P has jumped 24%. The two were pretty much in sync until last fall..

Microsoft has fared even worse against its most powerful AI competitor, Google. In June 2025, Google’s total value was $2.1 trillion, well behind Microsoft’s  $3.57 trillion. By  mid-June this year Google was worth $4.5 trillion, Microsoft, $2.8 trillion. That’s entirely due to Google’s AI push and Microsoft’s failure to improve Copilot significantly.

Matt Vellosso, who worked for Microsoft for 14 years — including four as technical advisor to CEO Satya Nadella and then as Partner Director for fostering AI innovation in Windows before leaving in 2023 — is scathing about what he views as Microsoft’s AI failures. 

He warned: “Microsoft missed the internet wave, the mobile wave and now it missed the AI wave.”

Show me the money

The most immediate likely impact on Microsoft after the three massive IPOs take place will be on the company’s stock price, which could well take another hit. Investors don’t want to miss out on the AI boom, and until now, there’s been a relatively small number of companies in which they could. When Anthropic and OpenAI join SpaceX as publicly traded companies, investors will have three more choices than they did only a few months ago. That could make it tougher for Microsoft to attract AI-focused investors. And that, in turn, could knock down its stock price. 

A lower stock price means the company will have a harder time raising money when it needs it. In addition, Microsoft won’t be able to as easily buy other companies in stock-only deals, because the value of its stock will be less.

Still, the IPOs are not all bad news for Microsoft’s stock position. It does, after all, own 27% of OpenAI. So if OpenAI is valued at $1 trillion after its IPO, Microsoft has a $270 billion stake in it.

Thumbs up for increased Azure revenue

One area where these mega IPOs should be unalloyed good news for Microsoft is in Azure revenue, which should significantly. Microsoft’s final divorce settlement with OpenAI requires the latter to buy $250 billion in Azure services through 2030. And its  estimated trillion-dollar valuation ensures the company will be around for the long term, meaning Microsoft can count on that revenue — and possibly more on an ongoing basis.

Microsoft will likely also get tens of billions of dollars from Anthropic for Azure cloud services. Anthropic might spend $43 billion annually on Azure cloud services by 2030, according to estimates by HSBC, one of the world’s largest banking and financial services companies.

Thumbs down for the effect on Copilot

Although Azure use will boom thanks to the IPOs, Microsoft’s own Copilot could face significant competition at a time when it’s having serious problems gaining traction. In its April 2026 earnings call, the company said Microsoft 365 Copilot had 20 million paid seats. That’s up from 15 million paid seats as of January, but still a minuscule number, considering Microsoft has 450 million Microsoft 365 commercial subscribers. That means only about 4% of the company’s business customers have been willing to pay for it since its launch in late 2023.

Beyond that, developers have been leaving GitHub Copilot and turning to Anthropic’s Claude Code and SpaceX’s recently purchased Cursor. A survey by the software development company JetBrains of more than 10,000 developers found that 29% used GitHub Copilot, 18% used Cursor and 18% used Claude Code. 

Early in 2025, GitHub Copilot had a commanding 67% market share.

More downside than up from the IPOs

Although the IPOs do have some upside for Microsoft — dramatically increased Azure revenue and several hundred billion dollars in OpenAI stock holdings — mostly, they’re bad news thanks to increased competition. 

Unless Microsoft significantly improves Copilot for businesses, developers and consumers, the company’s one-time AI dominance will erode even further.

Windows 11 25H2 has been publicly released, but behind the scenes, Microsoft is constantly working to improve the newest version of Windows. The company frequently rolls out preview builds to members of its Windows Insider Program, allowing them to test out — and help shape — upcoming features.

Skip to the latest builds

Our story “How to preview and deploy Windows 10 and 11 updates” details how the Insider program has worked until now. However, Microsoft recently announced sweeping changes to the program that will include the ability to select which new features to test. As the first step, the company is introducing a new channel system and transitioning Insiders like so:

• Beta Channel > Beta
• Beta Channel (for devices on Windows 11 version 26H1) > Beta (26H1)
• Dev Channel > Experimental
• Canary Channel (28000 series) > Experimental (26H1)
• Canary Channel (29500 series) > Experimental (Future Platforms)
• Release Preview Channel > Release Preview 24H2/25H2
• Release Preview Channel (for devices on Windows 11 version 26H1) > Release Preview (26H1)

This transition is happening over time, starting with the Dev Channel. See Microsoft’s blog post for more information about the transition.

Below you’ll find information about the Windows 11 preview builds that have been announced by Microsoft in the past six months. For each build, we’ve included the date of its release, which Insider channel it was released to, a summary of what’s in the build, and a link to Microsoft’s announcement about it.

Note: If you’re looking for information about updates being rolled out to all Windows 11 users, not preview builds for Windows Insiders, see “Windows 11: A guide to the updates.”

The latest Windows 11 Insider preview builds

Windows 11 Insider Preview Build 26220.8690

Release date: June 19, 2026

Released to: Beta Channel

This update improves the reliability of the Start menu and of Settings > Apps > Startup. It also fixes one virtualization bug that could result in bug checks citing HYPERVISOR_ERROR (0x20001) and KMODE_EXCEPTION_NOT_HANDLED (0x1E) errors after installing the latest flights on some devices during system restarts, virtual machine operations, or while running some gaming applications.

(Get more info about Windows 11 Insider Preview Build 26220.8690.)

Windows 11 Insider Preview Build 28020.2308

Release date: June 19, 2026

Released to: Beta 26H1 Channel

This update, in the words of Microsoft, “includes a small set of general improvements and fixes that improve the overall experience” of running Windows 11 26H1. It also improves the reliability of the inbox HD Audio driver.

(Get more info about Windows 11 Insider Preview Build 28020.2308.)

Windows 11 Insider Preview Build 26300.8697

Release date: June 19, 2026

Released to: Experimental Channel (formerly Dev)

Several minor new features are being rolled out gradually in this build, including improving visual consistency and reliability of the Copy dialog in Dark mode. It also fixes one virtualization bug that could result in bug checks citing HYPERVISOR_ERROR (0x20001) and KMODE_EXCEPTION_NOT_HANDLED (0x1E) errors after installing the latest flights on some devices during system restarts, virtual machine operations, or while running some gaming applications.

(Get more info about Windows 11 Insider Preview Build 26300.8697.)

Windows 11 Insider Preview Build 28120.2315

Release date: June 19, 2026

Released to: Experimental 26H1 Channel (formerly Canary)

This update, in the words of Microsoft, “includes a small set of general improvements and fixes that improve the overall experience” of running Windows 11 26H1. It also improves the reliability of the inbox HD Audio driver and improves caption style responsiveness by redrawing captions immediately for caption style changes.

(Get more info about Windows 11 Insider Preview Build 28120.2315.)

Windows 11 Insider Preview Build 29613.1000

Release date: June 19, 2026

Released to: Experimental Future Platforms Channel (formerly Canary optional 29500)

This build gradually rolls out adjustments to Settings > System > Sounds, by updating the “All sound devices” page with the ability to change default devices from this page and other enhancements.

(Get more info about Windows 11 Insider Preview Build 29613.1000.)

Windows 11 Insider Release Preview Builds 26100.8728 and 26200.8728

Release date: June 12, 2026

Released to: Release Preview 24H2/25H2 Channel

A wide variety of features and enhancements are being gradually rolled out in this build, including increased reliability of the Windows networking stack. It reduces bug checks (blue screen errors) related to Wi-Fi power and improves cellular (WWAN) connectivity, including support for IPv6 VPNs. Compatibility with third-party VPN software and SR-IOV configurations on server hardware is also improved. Network adapter settings and bindings are now preserved across OS upgrades.

Immediately rolling out are several quality improvements, including additional high-confidence device targeting data, increasing coverage of devices eligible to automatically receive new Secure Boot certificates. Devices receive the new certificates only after demonstrating sufficient successful update signals, maintaining a controlled and phased rollout.

(Get more info about Windows 11 Insider Preview Builds 26100.8728 and 26200.8728.)

Windows 11 Insider Preview Build 28000.2333

Released to: Release Preview 26H1 Channel

Release date: June 12, 2026

This build, for Insiders using Windows 11 26H1, gradually rolls out a wide variety of new features, including improved visibility into NPU usage in Task Manager. New optional NPU and NPU Engine columns are available on the Processes, Users, and Details pages, along with NPU Dedicated Memory and NPU Shared Memory optional columns on the Details page. Neural engines that are part of a GPU now appear on the Performance page, providing a more complete view of AI-related activity. A new optional Isolation column on the Processes and Details pages shows which apps are running in an AppContainer. You can add any of the new columns by right-clicking a column header in Task Manager and selecting them from the menu.

Being rolled out immediately is improved Netlogon secure channel connections between domain controllers, enabling successful connections from member servers to domain controllers set up before 2025.

(Get more info about Windows 11 Insider Preview Build 28000.2333.)

Windows 11 Insider Preview Build 26220.8680

Release date: June 12, 2026

Released to: Beta Channel

This update offers a wide variety of changes and improvements, including a new set of default Widget settings designed to reduce unexpected alerts and visual interruptions. They include:

• Disabling Open on hover by default
• Turning off Taskbar badging by default
• Opening to widgets experience on first launch
• Placing Weather as the only default widget on the lockscreen
• Restricting the number of Taskbar alerts that can be sent daily
• Limiting Taskbar alerts until you choose to open and engage with the Widgets experience

(Get more info about Windows 11 Insider Preview Build 26220.8680.)

Windows 11 Insider Preview Build 28020.2298

Release date: June 12, 2026

Released to: Beta 26H1 Channel

This update, in the words of Microsoft, “includes a small set of general improvements and fixes that improve the overall experience” of running Windows 11 26H1. It also introduces the new screen tint accessibility setting. In addition, Task Scheduler will now persist column width adjustments in task list view across sessions.

(Get more info about Windows 11 Insider Preview Build 28020.2298.)

Windows 11 Insider Preview Build 26300.8687

Release date: June 12, 2026

Released to: Experimental Channel (formerly Dev)

Several minor new features and enhancements are being rolled out gradually in this build, including improved reliability of loading the system tray area of the taskbar and a new recovery remote management plug-in for extending WinRE management capabilities for MDM providers.

(Get more info about Windows 11 Insider Preview Build 26300.8687.)

Windows 11 Insider Preview Build 28120.2302

Release date: June 12, 2026

Released to: Experimental 26H1 Channel (formerly Canary)

This update, in the words of Microsoft, “includes a small set of general improvements and fixes that improve the overall experience” of running Windows 11 26H1. It also accelerates app launch and core shell experiences such as Start menu, Search, and Action Center.

(Get more info about Windows 11 Insider Preview Build 28120.2302.)

Windows 11 Insider Preview Build 29599.1000

Release date: June 12, 2026

Released to: Experimental Future Platforms Channel (formerly Canary optional 29500)

This build gradually rolls out several minor changes and improvements, including improved performance when navigating to see storage on large volumes via Settings > System > Storage > Advanced Storage Settings > Disks & Volumes.

(Get more info about Windows 11 Insider Preview Build 29610.1000.)

Windows 11 Insider Preview Build 26220.8575

Release date: June 8, 2026

Released to: Beta Channel

This update adds the ability to extend Windows Update as many times as you need. It also fixes three bugs: one that caused audio not to work, another that impacted the reliability of Settings > Apps > Installed Apps, and a third that caused freezes with search, Notepad, and other parts of Windows.

(Get more info about Windows 11 Insider Preview Build 26220.8575.)

Windows 11 Insider Preview Build 28020.2236

Release date: June 8, 2026

Released to: Beta 26H1 Channel

This update, in the words of Microsoft, “includes a small set of general improvements and fixes that improve the overall experience” of running Windows 11 version 26H1.

(Get more info about Windows 11 Insider Preview Build 28020.2236.)

Windows 11 Insider Preview Build 28120.2242

Release date: June 8, 2026

Released to: Experimental 26H1 Channel (formerly Canary)

This update, in the words of Microsoft, “includes a small set of general improvements and fixes that improve the overall experience” of running Windows 11 version 26H1.

(Get more info about Windows 11 Insider Preview Build 28120.2242.)

Windows 11 Insider Preview Build 26220.8544

Release date: May 29, 2026

Released to: Beta Channel

Several minor new improvements and fixes are being rolled out in this build, including consistent solid (donut) spinners across key Windows scenarios including Boot, Logon, Restart, Shutdown, and Update. This update replaces legacy spinner visuals to deliver a more cohesive experience aligned with Windows design standards. Users will now see a unified spinner behavior with corresponding status text (e.g., “Restarting”, “Working on updates”, “Welcome”).

(Get more info about Windows 11 Insider Preview Build 26220.8544.)

Windows 11 Insider Preview Build 26300.8553

Release date: May 29, 2026

Released to: Experimental Channel (formerly Dev)

Several minor new features are being rolled out gradually in this build, including a number of changes to the Start menu. These were first outlined in the May 15 Insider blog post Making Taskbar and Start more personal. They include:

• “Recommended” section renamed to “Recent” in Start and Settings page
• Section-level toggles to independently show or hide Pinned, Recommended, and All
• Choose between a small and large Start menu, in addition to already available “Automatic (default)” setting
• Option to hide your name and profile picture in Start
• Redesigned Start menu settings page

One known issue, in which resetting your PC may have gotten stuck when using “Reset this PC,” has been fixed.

(Get more info about Windows 11 Insider Preview Build 26300.8553.)

Windows 11 Insider Preview Build 28020.2207

Release date: May 29, 2026

Released to: Experimental 26H1 Channel (formerly Canary)

This update, in Microsoft’s words, “includes a small number of minor bug fixes and improvements.”

(Get more info about Windows 11 Insider Preview Build 28020.2207.)

Windows 11 Insider Preview Build 29599.1000

Release date: May 29, 2026

Released to: Experimental Future Platforms Channel (formerly Canary optional 29500)

This build gradually rolls out several minor changes and improvements that, in the words of Microsoft, include “platform changes in moving to a new active development build.” The update also gradually rolls out a fix for a bug in which some Insiders unexpectedly saw an erroneous message saying they weren’t connected to internet (when they actually were) when signing into their Microsoft account in certain apps. It also improves CPU speed display on the Performance page of Task Manager for VMs, so it doesn’t show higher than unexpected numbers after resuming from hibernate.

There is one known issue that causes crashes with AMD machines supporting System Guard, so these devices in Windows Information Protection will not be offered the build.

(Get more info about Windows 11 Insider Preview Build 29599.1000.)

Windows 11 Insider Preview Build 26220.8491

Release date: May 22, 2026

Released to: Beta Channel

This update, in Microsoft’s words, “includes a small number of minor bug fixes and improvements.” It introduces Voice Isolation, a new option in Voice Access that helps the tool focus on your voice, even when others are speaking nearby, by filtering out other voices and background noise.

Microsoft says the single known issue with this release, in which your PC could have gotten stuck when using “Reset this PC,” has been fixed.

(Get more info about Windows 11 Insider Preview Build 26220.8491.)

Windows 11 Insider Preview Build 26300.8497

Release date: May 22, 2026

Released to: Experimental Channel (formerly Dev)

A variety of new features are being rolled out gradually in this build, including several to improve accessibility. Among them are making it easier to connect the Braille display to Narrator by using the HID open industry standard for Braille displays. If your display supports HID, connect it via USB, with no additional setup required. For Bluetooth, pair your HID Braille display in Settings > Bluetooth & devices just like any other accessory. Another new feature is Voice Isolation in Voice Access, as detailed for Beta Channel Build 26220.8491 above.

The build has one known issue, in which your PC may get stuck when using “Reset this PC.” To complete the reset successfully, choose the cloud download option (Cloud PBR) instead of local.

(Get more info about Windows 11 Insider Preview Build 26300.8497.)

Windows 11 Insider Preview Build 28020.2149

Released to: Experimental 26H1 Channel (formerly Canary)

Release date: May 22, 2026

This build, for Insiders using Windows 11 26H1, gradually rolls out a wide variety of new features, including one that improves the reliability of explorer.exe when closing the input switcher, and when switching between multiple desktops.

Microsoft says the single known issue with this release, in which your PC could have gotten stuck when using “Reset this PC,” has been fixed.

(Get more info about Windows 11 Insider Preview Build 28020.2149.)

Windows 11 Insider Preview Build 29595.1000

Release date: May 22, 2026

Released to: Experimental Future Platforms Channel (formerly Canary optional 29500)

This build, in the words of Microsoft, “includes platform changes in moving to a new active development build.”

(Get more info about Windows 11 Insider Preview Build 29595.1000.)

Windows 11 Insider Preview Build 26220.8474

Release date: May 15, 2026

Released to: Beta Channel

Several minor new improvements are being rolled out in this build, including one that improves the reliability of Simple Service Discovery Protocol (SSDP) notifications to help prevent the service from becoming unresponsive.

It has one known issue in which your PC may get stuck when using “Reset this PC.” To complete the reset successfully, choose the cloud download option (Cloud PBR) instead of local.

(Get more info about Windows 11 Insider Preview Build 26220.8474.)

Windows 11 Insider Preview Build 26300.8493

Release date: May 15, 2026

Released to: Experimental Channel (formerly Dev)

A variety of new features are being rolled out gradually in this build, including the ability to change the position of taskbar on your screen. In Settings > Personalization > Taskbar > Taskbar Behaviors, you can select the side of the screen you want your taskbar on: bottom, top, left, or right. In these other positions, tooltips, flyouts, and animations will still come from the taskbar, and most customization settings like “small taskbar” and “never combine taskbar icons” will work with all locations.

It has one known issue in which your PC may get stuck when using “Reset this PC.” To complete the reset successfully, choose the cloud download option (Cloud PBR) instead of local.

(Get more info about Windows 11 Insider Preview Build 26300.8493.)

Windows 11 Insider Preview Build 28020.2134

Release date: May 15, 2026

Released to: Experimental 26H1 Channel (formerly Canary)

This build gradually rolls out an improvement in the reliability of Simple Service Discovery Protocol (SSDP) notifications to help prevent the service from becoming unresponsive. It also rolls out gradual changes to updating Windows, including the ability to skip updates immediately during the out of box experience (OOBE) and to extend update pauses as many times as you need.

It has one known issue in which your PC may get stuck when using “Reset this PC.” To complete the reset successfully, choose the cloud download option (Cloud PBR) instead of local.

(Get more info about Windows 11 Insider Preview Build 28020.2134.)

Windows 11 Insider Preview Build 29591.1000

Release date: May 15, 2026

Released to: Experimental Future Platforms Channel (formerly Canary optional 29500)

This build introduces new features for Windows Update, including the ability to skip updates immediately during the out of box experience (OOBE) and to extend update pauses as many times as you need. New Windows update features also include having always available options to shut down and restart with updating, and additional insight about available updates to make more informed installation decisions.

(Get more info about Windows 11 Insider Preview Build 29591.1000.)

Windows 11 Insider Preview Builds 26200.8514/26200.8514

Release date: May 14, 2026

Released to: Release Preview 24H2/25H2 Channel

A wide variety of features and enhancements are being gradually rolled out in this build, including a new shared audio feature that allows two people to listen to the same audio from a single Windows 11 PC at the same time. In addition, Task Manager now offers improved visibility into NPU usage on PCs with an NPU. New optional NPU and NPU Engine columns are available on the Processes, Users, and Details pages, along with NPU Dedicated Memory and NPU Shared Memory optional columns on the Details page. 

One new feature is being rolled out immediately, in which Windows quality updates now include additional high-confidence device targeting data, increasing coverage of devices eligible to automatically receive new Secure Boot certificates. Devices receive the new certificates only after demonstrating sufficient successful update signals, maintaining a controlled and phased rollout.

(Get more info about Windows 11 Insider Preview Builds 26200.8514/26220.8514.)

Windows 11 Insider Preview Build 28000.2173

Released to: Release Preview 26H1 Channel

Release date: May 14, 2026

This build, for Insiders using Windows 11 26H1, gradually rolls out a wide variety of new features, including one that expands the list of archive formats that can be used in File Explorer to include uu, cpio, xar, and NuGet Packages (nupkg). Also being gradually rolled out is a new way to monitor your agents from the taskbar. It supports agents across first- and third-party apps, with Researcher in the Microsoft 365 Copilot app as the first adopter.

One new feature is being rolled out immediately, in which Windows quality updates now include additional high-confidence device targeting data, increasing coverage of devices eligible to automatically receive new Secure Boot certificates. Devices receive the new certificates only after demonstrating sufficient successful update signals, maintaining a controlled and phased rollout.

(Get more info about Windows 11 Insider Preview Build 28000.2173.)

Windows 11 Insider Preview Build 26220.8370

Release date: May 8, 2026

Released to: Beta Channel

Several minor new improvements are being gradually rolled out in this build, including improved reliability of Japanese IME usage when Administrator Protection is enabled. In addition, the build fixes a single bug, in which there were notification issues and certain apps hung on launch.

(Get more info about Windows 11 Insider Preview Build 26220.8370.)

Windows 11 Insider Preview Build 26300.8376

Release date: May 8, 2026

Released to: Experimental Channel (formerly Dev)

A variety of new features are being rolled out gradually in this build, including new File Explorer address bar support for paths containing double backslashes and quotation marks (for example, C:\Users\user or “C:\Users\user”), improving compatibility with a wider range of inputs.

(Get more info about Windows 11 Insider Preview Build 26300.8376.)

Windows 11 Insider Preview Build 28020.2075

Release date: May 8, 2026

Released to: Experimental 26H1 Channel (formerly Canary)

This build gradually rolls out, in Microsoft’s words, “a small set of general improvements and fixes that improve the overall experience” of running Windows 26H1. It also improves performance when opening clipboard history.

(Get more info about Windows 11 Insider Preview Build 28020.2075.)

Windows 11 Insider Preview Build 29585.1000

Release date: May 6, 2026

Released to: Experimental Future Platforms Channel (formerly Canary optional 29500)

This build gradually rolls out, in Microsoft’s words, “platform changes in moving to a new active development build.”

It also updates the experience when you use voice typing with the touch keyboard. To reduce distractions, the new design removes the previous full‑screen overlay and instead shows voice typing animations directly on the dictation key.

(Get more info about Windows 11 Insider Preview Build 29585.1000.)

Windows 11 Insider Preview Build 26220.8340

Release date: May 1, 2026

Released to: Beta Channel

Several minor new improvements are being gradually rolled out in this build, including making Windows ShareSheet more intelligent for Azure Active Directory (AAD) users, with a simple setting to turn promotional app recommendations on or off. Previously, that capability was only available to Windows users with Managed Service Accounts (MSA).

(Get more info about Windows 11 Insider Preview Build 26220.8340.)

Windows 11 Insider Preview Build 26300.8346

Release date: May 1, 2026

Released to: Experimental Channel (formerly Dev)

A variety of new features are being rolled out gradually in this build, including making Windows ShareSheet more intelligent for Azure Active Directory (AAD) users, with a simple setting to turn promotional app recommendations on or off. Previously, that capability was only available to Windows users with Managed Service Accounts (MSA). Another change “quiets” the default behavior for Widgets, with the goal of making them feel less distracting and overwhelming.

There are several known issues in this build, including one in which Insiders who use Feature flags to enable the new WIP experience may see the feature state incorrectly marked as current; however, changing state and applying changes will work as expected.

(Get more info about Windows 11 Insider Preview Build 26300.8346.)

Windows 11 Insider Preview Build 28020.1921

Release date: May 1, 2026

Released to: Experimental 26H1 Channel (formerly Canary)

This build gradually rolls out several improvements to Task Manager, including one that provides better insight into NPU usage for PCs that include an NPU. Optional NPU and NPU Engine columns are now available on the Processes, Users, and Details pages, with optional NPU Dedicated Memory and NPU Shared Memory columns on the Details page to give you deeper visibility into how workloads are using NPU resources. Additionally, if there are neural engines that are part of a GPU, they will now appear on the Performance page, providing a more complete view of AI‑related system activity.

(Get more info about Windows 11 Insider Preview Build 28020.1921.)

Windows 11 Insider Preview Build 29580.1000

Release date: May 1, 2026

Released to: Experimental Future Platforms Channel (formerly Canary optional 29500)

This build gradually rolls out, in Microsoft’s words, “a small set of general improvements and fixes that improve the overall experience for Insiders running this build on their PCs.”

(Get more info about Windows 11 Insider Preview Build 29580.1000.)

Windows 11 Insider Preview Build 26220.8283

Release date: April 24, 2026

Released to: Beta Channel

Several minor new improvements and fixes are being gradually rolled out in this build, including improved detection of clicks at the leftmost edge of the taskbar to invoke the Start menu when the taskbar icons are left-aligned.

(Get more info about Windows 11 Insider Preview Build 26220.8283.)

Windows 11 Insider Preview Build 26300.8289

Release date: April 24, 2026

Released to: Experimental Channel (formerly Dev)

In a phased rollout, Insiders in the Dev Channel are being moved to the new Experimental channel. Insiders who do not see the new experience on their device can enable it under Settings > Windows Update > Windows Insider Program > Feature flags.

Several minor new features are also being rolled out gradually in this build, including improved detection of clicks at the leftmost edge of the taskbar to invoke the Start menu when the taskbar icons are left-aligned.

There is one known issue in this build: Insiders who use Feature flags to enable the new Insider experience may see the feature state incorrectly marked as current; however, changing the state and applying changes should work as expected.

(Get more info about Windows 11 Insider Preview Build 26300.8289.)

Windows 11 Insider Preview Build 28200.1873

Release date: April 24, 2026

Released to: Experimental 26H1 Channel (formerly Canary)

This build is gradually rolling out a variety of small improvements, including an updated voice typing experience for the touch keyboard. To reduce distractions, the new design shows voice typing animations directly on the dictation key rather than on a full-screen overlay.

It also fixes a bug in which Settings > Network & Internet > Data Usage showed large, unrealistic values.

(Get more info about Windows 11 Insider Preview Build 28200.1873.)

Windows 11 Insider Preview Build 29576.1000

Release date: April 24, 2026

Released to: Experimental Future Platforms Channel (formerly Canary optional 29500)

This build is gradually rolling out a variety of changes, including Point-in-time restore for Windows, which can quickly roll your device back to a previous state, potentially helping minimize downtime and simplify troubleshooting when disruptions strike. 

(Get more info about Windows 11 Insider Preview Build 29576.1000.)

Windows 11 Builds 26100.8313 and 26200.8313 (KB5083631) 

Release date: April 17, 2026

Released to: Release Preview Channel

This build introduces a wide variety of new features rolled out gradually, including a new way to monitor your agents from the taskbar. It supports agents across first- and third-party apps, with Researcher in the Microsoft 365 Copilot app as the first adopter. When Researcher works on a report, Windows shows progress on the taskbar so you can check updates at a glance.

For IT administrators, the update gradually rolls out support for a dynamic app removal list to the “Remove Default Microsoft Store packages” policy for Windows Enterprise and Education. It also removes default trust for cross‑signed third-party drivers, while drivers from the Windows Hardware Compatibility Program (WHCP) and an allow list of trusted legacy drivers remain allowed. Enterprise State Roaming can now be managed through Windows Backup for Organizations policies.

The update also immediately introduces two minor improvements for everyone. Windows quality updates now include additional high-confidence device targeting data, which increases coverage of devices eligible to automatically receive new Secure Boot certificates. In Windows Security, the name of the affected application is now included in event logging related to CVE‑2024‑30098. This change makes it easier to identify applications that rely on smart card certificates and may need updates following recent security changes.

(Get more info about Windows 11 Builds 26100.8313 and 26200.8313.)

Windows 11 Insider Preview Build 26220.8271

Release date: April 17, 2026

Released to: Beta Channel

Several minor new features were made available in this build for those who have turned the toggle on to receive the latest updates, including improved reliability and performance of Windows Hello fingerprint after your PC wakes from sleep.

(Get more info about Windows 11 Insider Preview Build 26220.8271.)

Windows 11 Insider Preview Build 26300.8276

Release date: April 17, 2026

Released to: Dev Channel

In this build, several minor new features are being gradually rolled for those who have turned the toggle on to receive the latest updates, including improved reliability and performance of Windows Hello fingerprint after your PC wakes from sleep.

(Get more info about Windows 11 Insider Preview Build 26300.8276.)

Windows 11 Insider Preview Build 28020.1863

Release date: April 17, 2026

Released to: Canary Channel

For those who have turned the toggle on to receive the latest updates, this build fixes a bug that prevented some apps from signing in due to a false report of no internet connectivity. The fix is rolling out gradually.

(Get more info about Windows 11 Insider Preview Build 28020.1863.)

Windows 11 Insider Preview Build 29570.1000

Release date: April 17, 2026

Released to: Canary Channel (29500 build series)

For those who have turned the toggle on to receive the latest updates in the Canary Channel on the optional 29500 build series, this build has a variety of minor changes rolling out gradually, including more widget options and support for lock screen widget personalization, a new setting in Settings > Bluetooth & Devices > Touchpad that lets you can choose how large the right-click zone is, and support for a dynamic app removal list to the “Remove Default Microsoft Store packages” policy for Windows Enterprise and Education.

(Get more info about Windows 11 Insider Preview Build 29570.1000.)

Windows 11 Insider Preview Build 26220.8165

Release date: April 10, 2026

Released to: Beta Channel

For those who have turned the toggle on to receive the latest updates, this build gradually rolls out several minor features, including one in which the size limit for formatting FAT32 volumes via the command line has increased from 32GB to 2TB, and another in which the Windows Security app gets new badges and text that reflect your device’s Secure Boot state and certificate status.

It also gradually rolls out a fix for a bug that caused Settings > Network & Internet > Data Usage to show large, unrealistic values.

(Get more info about Windows 11 Insider Preview Build 26220.8165.)

Windows 11 Insider Preview Build 26300.8170

Release date: April 10, 2026

Released to: Dev Channel

For those who have turned the toggle on to receive the latest updates, this build gradually rolls out several minor features, including one in which the size limit for formatting FAT32 volumes via the command line has increased from 32GB to 2TB, and another in which the Windows Security app gets new badges and text that reflect your device’s Secure Boot state and certificate status.

It also gradually rolls out a fix for a bug that caused Settings > Network & Internet > Data Usage to show large, unrealistic values.

(Get more info about Windows 11 Insider Preview Build 26300.8170.)

Windows 11 Insider Preview Build 28020.1812

Release date: April 10, 2026

Released to: Canary Channel

For those who have turned the toggle on to receive the latest updates, this build gradually rolls out general improvements and fixes, including a new setting that lets users choose the size of their touchpad’s right-click zone, as well as new badges and text in the Windows Security app that reflect your device’s Secure Boot state and certificate status.

(Get more info about Windows 11 Insider Preview Build 28020.1812.)

Windows 11 Insider Preview Build 29565.1000

Release date: April 10, 2026

Released to: Canary Channel (29500 build series)

For those who have turned the toggle on to receive the latest updates in the Canary Channel on the optional 29500 build series, this build includes “platform changes in moving to a new active development build,” as well as new badges and text in the Windows Security app that reflect your device’s Secure Boot state and certificate status

(Get more info about Windows 11 Insider Preview Build 29565.1000.)

Windows 11 Insider Preview Build 26220.8148

Release date: April 3, 2026

Released to: Beta Channel

For those who have turned the toggle on to receive the latest updates, this build gradually rolls out several minor features, including a new icon in print settings to indicate when a printer supports Windows Protected Print Mode.

Several bugs are also being fixed, including one in which some apps weren’t able to sign in, citing an internal connection issue when internet was actually connected.

(Get more info about Windows 11 Insider Preview Build 26220.8148.)

Windows 11 Insider Preview Build 26300.8155

Release date: April 3, 2026

Released to: Dev Channel

For those who have turned the toggle on to receive the latest updates, this build gradually rolls out several minor features, including one in which users will be able to feel haptic feedback effects on compatible input devices while performing certain actions, such as aligning objects in PowerPoint, window snapping, resizing, or hovering over the Close button. These haptic effects can be configured in Settings under Bluetooth & devices > Mouse > Haptic signals.

Several bugs have also been fixed, including one in which some apps weren’t able to sign in, citing an internal connection issue when internet was actually connected.

(Get more info about Windows 11 Insider Preview Build 26300.8155.)

Windows 11 Insider Preview Build 28020.1803

Release date: April 3, 2026

Released to: Canary Channel

For those who have turned the toggle on to receive the latest updates in the Canary Channel, this build includes a small set of general improvements and fixes, including improved reliability for configuring the fluid dictation option in voice typing settings.

(Get more info about Windows 11 Insider Preview Build 28020.1803.)

Windows 11 Insider Preview Build 29560.1000

Release date: April 3, 2026

Released to: Canary Channel (29500 build series)

For those who have turned the toggle on to receive the latest updates in the Canary Channel on the optional 29500 build series, this build “includes platform changes in moving to a new active development build,” in the words of Microsoft. Several bugs have also been fixed, including one in which attached USB devices weren’t working for some Insiders.

(Get more info about Windows 11 Insider Preview Build 29560.1000.)

Windows 11 Insider Preview Build 26220.8138

Release date: March 30, 2026

Released to: Beta Channel

For those who have turned the toggle on to receive the latest updates, this build gradually rolls out several new features, including one in which you can enable Administrator Protection in Settings under Privacy & security > Windows Security > Account protection and switching the toggle to on. A restart will be required. 

(Get more info about Windows 11 Insider Preview Build 26220.8138.)

Windows 11 Insider Preview Build 26300.8142

Release date: March 30, 2026

Released to: Dev Channel

For those who have turned the toggle on to receive the latest updates, this build gradually rolls out several new features, including one in which you can enable Administrator Protection in Settings under Privacy & security > Windows Security > Account protection and switching the toggle to on. A restart will be required. 

(Get more info about Windows 11 Insider Preview Build 26300.8142.)

Windows 11 Insider Preview Build 28020.1797

Release date: March 30, 2026

Released to: Canary Channel

This update, in the words of Microsoft, “includes a small set of general improvements and fixes that improve the overall experience” of running Windows 11.

(Get more info about Windows 11 Insider Preview Build 28020.1797.)

Windows 11 Insider Preview Build 29558.1000

Release date: March 30, 2026

Released to: Canary Channel (29500 build series)

For those who have turned the toggle on to receive the latest updates in the Windows 11 Insider Canary Channel on the optional 29500 build series, this build introduces several new features, including a variety of improvements to the Windows Console, many of which were created by open-source contributors. Several bugs have also been fixed, including an authentication error people received when trying to connect to Azure Virtual Desktop.

(Get more info about Windows 11 Insider Preview Build 29558.1000.)

Windows 11 Insider Preview Build 26220.8079

Release date: March 20, 2026

Released to: Beta Channel

For those who have turned the toggle on to receive the latest updates, this build gradually rolls out several bug fixes, including for one in which the Network and Sharing Center incorrectly displayed two active Wi-Fi connections after switching from one Wi-Fi network to another. The Network and Sharing Center now correctly shows a single active Wi-Fi connection when you connect to a new network. 

(Get more info about Windows 11 Insider Preview Build 26220.8079.)

Windows 11 Insider Preview Build 26300.8085

Release date: March 20, 2026

Released to: Dev Channel

For those who have turned the toggle on to receive the latest updates, this build resumes rollout of the Point Indicator Accessibility setting, which enables low-vision users to easily locate and use their cursor. The build also introduces the new Feedback Hub, which offers Insiders simpler navigation and feedback submission flows.

In addition, several bugs were fixed, including one in which the Network and Sharing Center incorrectly displayed two active Wi-Fi connections after switching from one Wi-Fi network to another. The Network and Sharing Center now correctly shows a single active Wi-Fi connection when you connect to a new network.

(Get more info about Windows 11 Insider Preview Build 26300.8085.)

Windows 11 Insider Preview Build 28020.1743

Release date: March 20, 2026

Released to: Canary Channel

For those who have turned the toggle on to receive the latest updates, this build includes several new features being rolled out gradually, including one in which shared audio now provides individual sliders for each listener which adjusts their volume without affecting the other. You can continue to adjust volume for both listeners at the same time through the main volume controls available through Quick Settings or on-device and keyboard controls.

The build also introduces the new Feedback Hub, which offers Insiders simpler navigation and feedback submission flows.

(Get more info about Windows 11 Insider Preview Build 28020.1743.)

Windows 11 Insider Preview Build 29553.1000

Release date: March 20, 2026

Released to: Canary Channel (29500 build series)

For those who have turned the toggle on to receive the latest updates in the Canary Channel’s optional 29500 build series, this build introduces the new Feedback Hub, which offers Insiders simpler navigation and feedback submission flows.

(Get more info about Windows 11 Insider Preview Build 29553.1000.)

Windows 11 Insider Preview Build 26220.8062

Release date: March 13, 2026

Released to: Beta Channel

For those who have turned the toggle on to receive the latest updates, this build includes numerous changes and refinements, including an update to the “Remove Default Microsoft Store packages” policy for Windows Enterprise and Education SKUs that allows IT administrators to remove MSIX/APPX apps by adding their app package family name (PFNs) to a dynamic list.

Starting with this update, the Windows kernel will enforce a new policy removing default trust for cross-signed drivers. The policy allows third-party drivers from the WHCP program by default, with an allow list of trustworthy publishers and drivers from the cross-signing program.

(Get more info about Windows 11 Insider Preview Build 26220.8062.)

Windows 11 Insider Preview Build 26300.8068

Release date: March 13, 2026

Released to: Dev Channel

For those who have turned the toggle on to receive the latest updates, this build includes numerous changes and refinements, including an update to the “Remove Default Microsoft Store packages” policy for Windows Enterprise and Education SKUs that allows IT administrators to remove MSIX/APPX apps by adding their app package family name (PFNs) to a dynamic list.

Starting with this update, the Windows kernel will enforce a new policy removing default trust for cross-signed drivers. The policy allows third-party drivers from the WHCP program by default, with an allow list of trustworthy publishers and drivers from the cross-signing program.

(Get more info about  Windows 11 Insider Preview Build 26300.8068.)

Windows 11 Insider Preview Build 28020.1737

Release date: March 13, 2026

Released to: Canary Channel

For those who have turned the toggle on to receive the latest updates, this build makes refinements to the Pen settings page, including small changes to the options for the pen tail button. A new option, “Same as Copilot key,” enables the pen tail button to launch the same app as the Copilot key.

(Get more info about Windows 11 Insider Preview Build 28020.1737.)

Windows 11 Insider Preview Build 29550.1000

Release date: March 13, 2026

Released to: Canary Channel (29500 build series)

For those  who have turned the toggle on to receive the latest updates in the Canary Channel’s optional 29500 build series, this build has a variety of minor changes, including one in which changes to global power settings (for example, Display, Sleep, Hibernate timeouts, Power/Sleep button, and lid close actions) from Settings are now applied to all power plans. This should help improve persistence of chosen settings.

(Get more info about Windows 11 Insider Preview Build 29550.1000.)

Windows 11 Insider Preview Builds 26100.8106 and 26200.8106

Release date: March 12, 2026

Released to: Release Preview Channel

This build introduces a wide range of minor features being rolled out gradually, including the ability to turn Smart App Control (SAC) on or off without needing a clean install. To make changes, go to Settings > Windows Security > App & Browser Control > Smart App Control settings. When turned on, SAC helps block untrusted or potentially harmful apps.

The update also improves stability in Windows Recovery Environment (Windows RE) when you run x64 apps on ARM64 devices. These apps run more smoothly and respond as expected.

(Get more info about Windows 11 Insider Preview Builds 26100.8106 and 26200.8106.)

Windows 11 Insider Preview Build 26220.7961

Release date: March 6, 2026

Released to: Beta Channel

For those who have turned the toggle on to receive the latest updates, this build re-enables Administrator protection, which aims to protect free-floating admin rights for administrator users, allowing them to still perform all admin functions with just-in-time admin privileges. This feature is off by default and can be enabled via OMA-URI in Intune or via group policy.

Other changes and improvements being gradually rolled out to the same group include the ability to use voice typing (Windows key + H) when renaming files in File Explorer, as well as a smaller peek view in the drag tray.

(Get more info about Windows 11 Insider Build 26220.7961.)

Windows 11 Insider Preview Build 26300.7965

Release date: March 6, 2026

Released to: Dev Channel

For those who have turned the toggle on to receive the latest updates, this build re-enables Administrator protection, which aims to protect free-floating admin rights for administrator users, allowing them to still perform all admin functions with just-in-time admin privileges. This feature is off by default and can be enabled via OMA-URI in Intune or via group policy.

Other changes and improvements being gradually rolled out to the same group include the ability to use voice typing when renaming files in File Explorer, as well as a smaller peek view in the drag tray.

(Get more info about Windows 11 Insider Preview Build 26300.7965.)

Windows 11 Insider Preview Build 28020.1685

Release date: March 6, 2026

Released to: Canary Channel

For those who have turned the toggle on to receive the latest updates, this build lets you use voice typing (Windows key + H) when renaming files in File Explorer. The build also improves the reliability of removing Windows Update files and windows.old files via Settings > System > Storage.

(Get more info about Windows 11 Insider Preview Build 28020.1685.)

Windows 11 Insider Preview Build 26220.7934

Release date: Feb. 27, 2026

Released to: Beta Channel

For those who have turned the toggle on to receive the latest updates, this build gives administrators and Application Control for Business policy authors additional controls over the processing of batch files and CMD scripts. Starting with this release, admins can enable a more secure mode for processing batch files that ensures they do not change during execution by adding a value to the registry key HKEY_LOCAL_MACHINE\Software\Microsoft\Command Processor named LockBatchFilesWhenInUse (DWORD, value 0 or 1). Policy authors can also use the LockBatchFilesWhenInUse application manifest control documented here to enable this mode.

There are a variety of other improvements being rolled out gradually, including one in which a new taskbar indicator displays while you’re sharing, giving a quick reminder that audio is still being shared. Clicking the indicator is a fast path to open sharing settings to change volume or stop sharing.

(Get more info about Windows 11 Insider Preview Build 26220.7934.)

Windows 11 Insider Preview Build 26300.7939

Release date: Feb. 27, 2026

Released to: Dev Channel

For those who opted to receive the latest updates, this build gives administrators and Application Control for Business policy authors additional controls over the processing of batch files and CMD scripts. Starting with this release, admins can enable a more secure mode for processing batch files that ensures they do not change during execution by adding a value to the registry key HKEY_LOCAL_MACHINE\Software\Microsoft\Command Processor named LockBatchFilesWhenInUse (DWORD, value 0 or 1). Policy authors can also use the LockBatchFilesWhenInUse application manifest control documented here to enable this mode.

There are a variety of other improvements being rolled out gradually, including one in which a new taskbar indicator displays while you’re sharing, offering a quick reminder that audio is still being shared. Clicking the indicator is a fast path to open sharing settings to change volume or stop sharing.

(Get more info about Windows 11 Insider Preview Build 26300.7939.)

Windows 11 Insider Preview Build 28020.1673

Release date: Feb. 27, 2026

Released to: Canary Channel

For those who have opted to receive the latest updates, this build gets a variety of new features being rolled out gradually, including one in which Quick Machine Recovery (QMR) now turns on automatically for enterprise managed Windows Professional devices, as well as Windows Professional devices that are not domain-joined. These devices receive the same recovery features available to Windows Home users. For domain-joined devices, QMR stays off unless it is enabled by the organization.

(Get more info about Windows 11 Insider Preview Build 28020.1673.)

Windows 11 Insider Preview Build 26220.7872

Release date: February 20, 2026

Released to: Beta Channel

For those who have turned the toggle on to receive the latest updates, this build offers a variety of new features, including simplified specifications on the ‘Device info’ Card on the Settings Home page and improved mouseover animations for app groups on the taskbar.

(Get more info about Windows 11 Insider Preview Build 26220.7872.)

Windows 11 Insider Preview Build 26300.7877

Release date: February 20, 2026

Released to: Dev Channel

For those who have turned the toggle on to receive the latest updates, this build offers a variety of new features, including simplified specifications on the ‘Device info’ Card on the Settings Home page and improved mouseover animations for app groups on the taskbar.

Several bugs have also been fixed, including one in which all File Explorer open windows and tabs unexpectedly jumped to Desktop or Home.

Get more info about Windows 11 Insider Preview Build 26300.7877.)

Windows 11 Insider Preview Build 28020.1619

Release date: February 20, 2026

Released to: Canary Channel

For those who have turned the toggle on to receive the latest updates, this build offers a variety of new features, including one in which Windows Hello Enhanced Sign-in Security (ESS) supports peripheral fingerprint sensors. Previously, ESS was only available on PCs with built-in biometric sensors, but now it can be used when you plug in a supported ESS fingerprint reader.

(Get more info about Windows 11 Insider Preview Build 28020.1619.)

Optional Windows 11 Insider Preview Build 29531.1000

Release date: February 18, 2026

Released to: Canary Channel

This build is the first in a new Canary Channel optional path with a focus on platform development, which will introduce new features before the existing 28000 Canary Channel series. Microsoft recommends that most people remain on the 28000 build path, but adds that those who want to get the newest platform changes as early as possible may want to switch to this new 29500 path. Note, though, that if you switch to the 29500 path by installing this build, you won’t be able to go back to the 28000 Canary Channel series.

The build itself, in Microsoft’s words, “includes platform changes in moving to a new active development build.”

Microsoft warns, “because of the focus on platform development for this path, you may notice a temporary loss in some features that you have today. These features will return to this new active development build.”

(Get more info about Windows 11 Insider Preview Build 29531.1000.)

Windows 11 Insider Preview Build 26220.7859

Release date: February 17, 2026

Released to: Beta Channel

For those who have turned the toggle on to receive the latest updates, this build displays an option to upgrade to a different Microsoft 365 plan on the Accounts page within the Settings app. It also rolls out fixes for several bugs, including one in which all File Explorer open windows and tabs unexpectedly jumped to Desktop or Home.

(Get more info about Windows 11 Preview Build 26220.7859.)

Windows 11 Insider Preview Builds 26100.7918 and 26200.7918

Release date: February 17, 2026

Released to: Release Preview Channel

This build gradually rolls out a variety of new features, including one in which Quick Machine Recovery (QMR) now turns on automatically for Windows Professional devices that are not domain‑joined and not enrolled in enterprise endpoint management. These devices receive the same recovery features available to Windows Home users. For domain‑joined or enterprise managed devices, QMR stays off unless it is enabled by the organization. The build also improves login screen reliability.

(Get more info about Windows 11 Insider Preview Builds 26100.7918 and 26200.7918.)

Windows 11 Insider Preview Build 28020.1611

Release date: February 12, 2026

Released to: Canary Channel

This build brings Sysmon functionality natively to Windows. Sysmon functionality allows you to capture system events that can help with threat detection, and you can use custom configuration files to filter the events you want to monitor. The captured events are written on the Windows event log, enabling them to be used with security applications and in a wide range of use cases.

(Get more info about Windows 11 Insider Preview Build 28020.1611.)

Windows 11 Insider Preview Build 26220.7755

Release date: February 9, 2026

Released to: Beta Channel

For those who have turned the toggle on to receive the latest updates, this build gradually rolls out several new features, including Emoji 16.0, which contains a new set of emojis, and the ability to directly control pan and tilt for supported cameras in the Settings app.

(Get more info about Windows 11 Insider Preview Build 226220.7755.)

Windows 11 Insider Preview Build 26300.7760

Release date: February 9, 2026

Released to: Dev Channel

For those who have turned the toggle on to receive the latest updates, this build gradually rolls out several new features, including Emoji 16.0, which contains a new set of emojis, and the ability to directly control pan and tilt for supported cameras in the Settings app.

(Get more info about Windows 11 Insider Preview Build 26300.7760.)

Windows 11 Insider Preview Build 28020.1546

Release date: February 4, 2026

Released to: Canary Channel

This update, in the words of Microsoft, “includes a small set of general improvements and fixes that improve the overall experience for Insiders” running Windows.

It also fixes one bug that affected apps working with files stored on OneDrive or Dropbox.

(Get more info about Windows 11 Insider Preview Build 28020.1546.)

Windows 11 Insider Preview Build 26220.7752

Release date: February 3, 2026

Released to: Beta Channel

Those who have turned the toggle on to receive the latest updates get Sysmon functionality natively in Windows. Sysmon functionality allows you to capture system events that can help with threat detection, and you can use custom configuration files to filter the events you want to monitor. The captured events are written on the Windows event log, enabling them to be used with security applications and a wide range of use cases. (This feature is being gradually rolled out.)

The same group also gets a number of bug fixes being gradually rolled out, including for a File Explorer bug in which icons/tooltips for “Add to favorites” were missing.

(Get more info about Insider Preview Build 26220.7752.)

Windows 11 Insider Preview Build 26300.7733

Release date: February 3, 2026

Released to: Dev Channel

Those who have turned the toggle on to receive the latest updates get Sysmon functionality natively in Windows. Sysmon functionality allows you to capture system events that can help with threat detection, and you can use custom configuration files to filter the events you want to monitor. The captured events are written on the Windows event log, enabling them to be used with security applications and a wide range of use cases. (This feature is being gradually rolled out.)

The same group also gets a number of bug fixes being gradually rolled out, including for a File Explorer bug in which icons/tooltips for “Add to favorites” were missing.

(Get more info about Insider Preview Build 26300.7733.)

Windows 11 Insider Preview Build 28020.1495

Release date: January 28, 2025

Released to: Canary Channel

This build, in Microsoft’s words, “includes a small set of general improvements and fixes that improve the overall experience [of Windows 11].” It also fixes a variety of bugs, including one that led to the Windows Update settings page hanging when loading.

The build has two known issues, one that sometimes causes all open File Explorer windows and tabs to unexpectedly jump to Desktop or Home in File Explorer, and another in which the desktop watermark is showing the wrong build number.

(Get more info about Insider Preview Build 28020.1495.)

Windows 11 Insider Preview Builds 26100.7701 and 26200.7701

Release date: January 27, 2026

Released to: Release Preview Channel

This build gradually rolls out a variety of new features for Copilot+ PCs, including one in which Narrator gives you more control over how it announces on‑screen controls. You can choose which details are spoken and adjust their order to match how you navigate apps. These settings apply throughout the app to help reduce extra speech and make Narrator easier to follow.

The build also immediately rolls out a variety of new features for all PCs, including one in Data Protection Application Programming Interface (DPAPI) domain backup key management. Administrators can now set how often keys rotate automatically. This strengthens cryptographic security and reduces reliance on older encryption algorithms.

(Get more info about Insider Preview Builds 26100.7701 and 26200.7701.)

Windows 11 Insider Preview Build 26220.7670

Release date: January 27, 2026

Released to: Beta Channel

For those who have turned the toggle on to receive the latest updates, this build gradually rolls out several bug fixes, including for an issue in which the Search process was showing an icon with an X instead of a magnifying glass.

The build has five known issues, including one in which some Insiders’ apps aren’t showing in the system tray when they should be.

(Get more info about Insider Preview Build 26220.7670.)

Windows 11 Insider Preview Build 26300.7674

Release date: January 27, 2026

Released to: Dev Channel

In this build, the Dev Channel jumps ahead to receive 26300 series builds. This means that the window to switch from the Dev Channel to the Beta Channel is closed once Build 26300.7674is installed on your PC. This build for the Dev Channel is identical to the Windows 11 Build 26220.7653 release (see below).

(Get more info about Insider Preview Build 26300.7674.)

Windows 11 Insider Preview Build 26220.7653

Release date: January 21, 2026

Released to: Dev Channel

This build for the Dev Channel is identical to the January 16th Windows 11 Insider Preview Build 26220.7653 released to the Beta Channel. See the writeup below for details.

(Get more info about Windows 11 Insider Preview Build 26220.7653.)

Windows 11 Insider Preview Build 26220.7653

Release date: January 16, 2026

Released to: Beta Channel

For those who have turned the toggle on to receive the latest updates, this build gradually rolls out several changes, including one in which you can now set .webp images for your desktop background in Settings > Personalization > Desktop Background.

The same group also gets a number of bug fixes being gradually rolled out, including for a bug in which Settings crashed when interacting with audio devices.

The build has four known issues, including one in which some Insiders’ apps aren’t showing in the system tray when they should be.

(Get more info about Windows 11 Insider Preview Build 26220.7653.)

Windows 11 Insider Preview Build 28020.1371 

Release date: January 14, 2026

Released to: Canary Channel

This build gradually rolls out a variety of bug fixes for those who have turned the toggle on to receive the latest updates, including a bug in which File Explorer showed a white flash when navigating between pages.

There is one known issue in this build: The desktop watermark shows the wrong build number.

(Get more info about Windows 11 Insider Preview Build 28020.1371.)

Windows 11 Insider Preview Build 26220.7535

Release date: January 9, 2026

Released to: Dev & Beta Channels

For those who have turned the toggle on to receive the latest updates, this build gradually rolls out Copilot-powered image descriptions to Narrator on Copilot+ PCs, making it possible for blind and low-vision users to hear detailed, AI-generated descriptions of images, charts, and graphs.

The same group also gets a number of bug fixes being gradually rolled out, including for an issue in which File Explorer was causing explorer.exe to crash for some Insiders when invoking the context menu on the desktop.

The build has seven known issues, including one in which Settings crashes when interacting with audio devices.

(Get more info about Windows 11 Insider Preview Build 26220.7535.)

One of the most commonly used Microsoft programs, Excel is highly useful for data collecting, processing, and analysis. To fully harness Excel’s powers, though, you need to make use of formulas.

Excel formulas allow you to perform calculations, analyze data, and return results quickly and accurately. The usefulness of formulas is even greater once you start dealing with large data sets. With the correct formula, Excel can process vast amounts of information in a matter of seconds.

In this article we’ll look at five useful types of formulas and functions that will get you started performing data analysis in Excel. Along the way, you’ll learn several different ways to enter formulas and functions in Excel.

We’ll demonstrate using Excel for Windows under a Microsoft 365 subscription. If you’re using a different version of Excel, you might not have exactly the same interface and options, but the formulas and functions work the same.

If you have the right kind of M365 subscription, you can have Microsoft’s generative AI assistant, Copilot, create formulas for you. This requires an M365 Personal, Family, or Premium plan for individuals or an M365 business or enterprise plan with a paid Copilot add-on subscription — which means not everybody has access to Copilot in Excel. Even if you do, it’s helpful to know what formulas can do and how to work with them so you can write better prompts for Copilot. We’ll cover using Copilot to create Excel formulas later in this story, but first we’ll give you a solid understanding of how to work with formulas and functions.

In this article:

• What is a formula in Excel?
• What is a function in Excel?
• Basic mathematical formulas and functions
• The IF function
• The SUMIF and COUNTIF functions
• The CONCAT function
• The VLOOKUP function
• Using Copilot to create Excel formulas

What is a formula in Excel?

A formula is an expression that operates on values in a range of cells in Excel. Using formulas, you can perform calculations and data analysis on the contents of the cells. Formulas can be as simple as adding a column of numbers together or as complex as returning the kurtosis of a data set. They can be incredibly useful when you want to turn spreadsheet data into meaningful information for driving business decisions.

What is a function in Excel?

A function is a built-in formula in Excel — basically, a shortcut for performing a calculation or other operation on cell data. There are around 500 Excel functions, and the list continues to grow every year. Fortunately, most of the actions that a typical business user would want to perform can be done with just a handful of functions.

1. Basic mathematical formulas and functions

We’re going to group these formulas together since they are very simple and have similar syntax. All formulas in Excel start with the equal sign (=) and build from there.

Adding, subtracting, multiplying, and dividing

To add the numbers in two cells together, first click the on the target cell where you want the total to appear. Then type = in the cell to start the formula.

Next, click on the cell that contains the first number you want to add, and its cell reference (such as A2) will appear next to the equal sign in the formula.

Type + next to the first cell reference. Then click the cell that contains the second number you want to add, and its cell reference (such as A3) will appear next to the + sign. The full syntax for the formula to add the values in cells A2 and A3 is:

=A2+A3

Note that in addition to appearing in the target cell, the formula also appears in the formula bar directly above the worksheet. Once you’ve inserted the initial = sign in the target cell, you can type your formula in the formula bar. It’s sometimes easier to see the whole formula and work with it in the formula bar than down in the worksheet page.

If you wanted to add additional numbers to your total, you’d type another + sign, select another cell, and so on. Once your formula is complete, press Enter, and the result appears in the target cell.

Subtraction, multiplication, and division calculations work the same way. You simply change the operator — the symbol that tells Excel what math operation you want to perform — from the + sign to the – sign for subtraction, the * sign for multiplication, or the / sign for division.

Adding numbers with the SUM function

There’s a quicker way to add together a group of numbers. This is where Excel’s built-in SUM function comes in.

First click on the target cell where you want the total to appear. Then type =SUM to start the function.  A list of options will come up. Click the first option, SUM. You’ll now see =SUM( in the target cell.

Just underneath the cell with the SUM function is a tooltip showing the SUM syntax:

=SUM(number 1, [number2],…)

To add individual cells together, select a cell, type a comma, select another cell, and so on. (Alternatively, you can type a cell reference, type a comma, type another cell reference, and so on.)

If you want to add consecutive cells (such as in a row or column), select the first cell, then hold down the Shift key and select the final cell in the group. (Or you can type in the cell references for the first and last cells separated by a colon — for instance, A2:A7 selects A2, A7, and all the cells in between.)

Once all the cells you want to add together are selected, hit Enter.

Now you should see the final result, which is the sum of the numbers you highlighted. If you highlight that target cell again, you’ll see the full formula in the formula bar — in our example, it’s:

=SUM(A2:A7)

One important thing to note for all Excel formulas is that they produce relative values. This simply means that if any of the values in the selected cells changes, then the final number will change to reflect that.

If you want to make it an absolute value, a number that will not change even if the cells that were used to calculate it change, then you need to right-click the cell and select Copy from the pop-up menu. Then right-click the cell again and, under Paste Options, select the Values button (the icon of a clipboard with 123).

Now when you select that cell you’ll just see the plain number, not a formula, in the formula bar.

Tip: Excel provides a SUM shortcut in certain circumstances. If you have a series of numbers in a row or a column, Excel assumes you want to add them together. So if you place your cursor in the cell to the right of a row of numbers and click the AutoSum (Σ) button toward the right end of the Ribbon’s Home tab, Excel automatically selects the numbers in the row, then adds them together when you press Enter. Likewise, if you place your cursor in the cell below a column of numbers, click AutoSum, and hit Enter, Excel totals up the numbers in the column.

Calculating the average with the AVERAGE function

To calculate the average of a group of numbers, repeat the same steps but using the syntax =AVERAGE and highlighting the cells containing the numbers that you want to use in the calculation.

Tip: As with SUM, there’s a shortcut for using the AVERAGE function if you have a series of numbers in a row or a column. Place your cursor in the cell to the right of a row of numbers or in the cell below a column of numbers. Click the tiny down arrow at the right side of the AutoSum button, select Average from the menu that appears, and hit Enter. Excel calculates the average of the values in that row or column.

Find more details, examples, and best practices for these functions at Microsoft’s SUM function and AVERAGE function support pages.

2. The IF function

This function helps you automate the decision-making process by applying if-then logic to your data. Using this function, you can have Excel perform a calculation or display a certain value depending on the outcome of a logical test. For example, you can create a test that checks if the value of a cell is greater than or equal to the value of 18 and enter “Yes” or “No” accordingly.

While we’re learning this function, we’ll cover another way to enter functions in Excel: by using the Formulas tab on the Ribbon. Here you’ll find buttons that provide quick access to functions by category: AutoSum, Financial, Logical, Text, Date & Time, and so on. Being able to browse through functions by category can be helpful if you can’t remember the exact name of a function or aren’t sure how to spell it.

To enter the IF function, select the target cell, and on the Formulas tab, click the Logical button, then select IF from the list of functions that appears.

Alternatively, you can click the Insert Function button all the way to the left of the Formulas tab. An “Insert Function” pane appears, showing a list of commonly used functions.

Select IF from the list and click OK. (If the function you want isn’t in the “Commonly Used” list, select a different category or All to see all available functions.)

The Function Arguments pane appears, and you’ll see =IF() in the target cell.

The IF function syntax is as follows:

=IF(logical_test,”value_if_true”,”value_if_false”)

You’ll notice that the Function Arguments pane for the IF function has fields for Logical_test, Value_if_true, and Value_if_false. In our “greater than or equal to 18” example, the logical test is whether the number in the selected cell is greater than or equal to 18, the value if true is “Yes,” and the value if false is “No.” So we’d enter the following items in the pane’s fields like so:

Logical_test: B2>=18

Value_if_true: “Yes”

Value_if_false: “No”

or just type the full formula into the target cell:

=IF(B2>=18,”Yes”,”No”)

This tells Excel that if the value of cell B2 is greater than or equal to 18, it should enter “Yes” in the target cell. If the value of cell B2 is less than 18, it should enter “No.”

Tip: When using functions like this, rather than entering the function repeatedly for each row, you can simply click and drag the tiny square on the bottom right of the cell that contains the function. Doing so will autofill each of the rows with the formula, and Excel will change your cell references to match. For example, when the formula we used in cell C2 that references cell B2 is autofilled into cell C3, it changes to reference cell B3 automatically.

Find more details at Microsoft’s IF function support page.

3. The SUMIF and COUNTIF functions

SUMIF is a more advanced SUM function that allows you to add up only the values in a range that meet the criteria you specify. To use this function, you must specify the range of cells to apply the criteria to, the criteria for inclusion, and, optionally, the sum range, which is the range of cells to total if that’s different from the initial range. The syntax is as follows:

=SUMIF(range,criteria,[sum_range])

Note that any criteria with text or mathematical or logical symbols must be enclosed in double quotes.

In the sales spreadsheet shown below, for example, suppose you want to total up only the sales that are more than $100. The criteria range is C2 to C9, and the criteria is “greater than 100.” Since you’re adding up the values in that same cell range (C2 to C9), you don’t need to supply a separate sum range. So your formula is:

=SUMIF(C2:C9,”>100″)

What if instead you want to find the total for all sales in the East region only? To do that you’ll have to specify both the criteria range (cells B2 to B9) and the sum range (cells C2 to C9). This is the formula:

=SUMIF(B2:B9,B2,C2:C9)

Note that you don’t have to type out “East” for the criteria. You can simply type B2 or click the cell B2 to have Excel search for the text it contains.

There is a similar function called COUNTIF that lets you create a count of values that meet specified criteria. The syntax is as follows:

=COUNTIF(range,criteria)

So to count the total number of sales in the West region, for instance, you supply the range of cells to apply the criteria to (B2 to B9), followed by the criteria (“West” or cell B3). The formula is:

=COUNTIF(B2:B9,B3)

What if you want to apply multiple criteria to your data, such as calculating total sales for books in the East region, or counting the number of sales over $100 in the West region? Excel can do that too, via functions called SUMIFS and COUNTIFS. These functions use more complex syntax than SUMIF and COUNTIF. For more details, use cases, and best practices for all four of these functions, see Microsoft’s SUMIF, SUMIFS, COUNTIF, and COUNTIFS support pages.

4. The CONCAT function

This function is useful for piecing together text from different cells into one complete string. For instance, maybe you have a worksheet with different columns for people’s first and last names, but you want to put first and last names together. Other common use cases are completing an address, reference number, file path, or URL. The syntax is as follows:

=CONCAT(text1,text2,text3,…)

In this example we will use CONCAT to combine a list of first names and last names into a full name with a space in between. To do so we simply place the cursor in cell C2, type =CON and select CONCAT from the list of options that appears. Next, select the cell that contains the first name (A2) and add a comma, a blank space surrounded by quotation marks, and another comma. Then add the last name by selecting the adjacent cell (B2) and hit Enter. Here’s the full formula:

=CONCAT(A2,” “,B2)

Next, click and drag the bottom right of cell C2 to autofill the formula in all the other rows.

For more details and examples, see Microsoft’s CONCAT function support page.

5. The VLOOKUP function

This is one of the most commonly used functions in Excel and a valuable data analysis tool. VLOOKUP lets you look up a value in a table and return information from other columns related to that value. It’s very useful for combining data from different lists or comparing two lists to find matching items. To use this function, you need to provide three to four pieces of information:

1. The value you want to look for. This is known as the lookup value.
2. The range of cells to look in. This is known as the table array.
3. The column that contains the information you want to return, called the column index number.
4. Optionally, the type of lookup you want to perform: TRUE or FALSE. This is known as the range lookup. FALSE means you want an exact match for the lookup value, while picking TRUE returns the best approximate match. If you don’t specify a range lookup, VLOOKUP defaults to TRUE.

The syntax is as follows:

=VLOOKUP(lookup_value,table_array,column_index_number,[range_lookup])

The lookup value must be in the first column of cells you specify in the table array. The leftmost column in the table array has a column index number of 1, with subsequent columns numbered 2, 3, and so on.

In this example, we’ll look up what region our employees work in. To do so, we first need to specify the value that we are going to search for: the employee name Mike (cell A2). Next, we need to highlight the entire cell range (table array) that we want to look in: cells F2:G8.

Then we specify which column holds the information that we want. Rather than picking the column itself, we count from left to right within the table array. Since the column that contains the region is the second from the left, type in 2.

Lastly, we enter the TRUE (best approximate match) or FALSE (exact match) option. TRUE is typically only used with numbers or when you aren’t sure if the value you want is in the table. Since we know the value we want is in the table, we will pick FALSE. Generally, FALSE is the better option, as it returns more accurate results.

This is the full formula:

=VLOOKUP(A2,F2:G8,2,FALSE)

This is an oversimplified example using a small data set, but when you need to search through a spreadsheet with thousands (or tens of thousands) of cells, VLOOKUP is a huge time-saver and reduces the possibility of errors. For more details and examples, see Microsoft’s VLOOKUP function support page.

Using Copilot to create Excel formulas

Remembering all these different formulas and functions can be difficult, so another good approach for those who have access to Copilot in Excel (see details at the top of this story) is to use the AI tool to dynamically create formulas that meet your needs. Using Copilot, you can describe what you want the formula to do  and have the AI generate the syntax for you. In this section we’ll demonstrate with two sample data sets.

To access Copilot, click the Copilot icon on your ribbon toolbar or at the bottom right of your screen.

The Copilot sidebar opens along the right side of your spreadsheet. Type in a prompt describing the formula you want created — in this example, a simple formula that adds up all the sales values in the data set. Be sure to instruct Copilot where to place the formula:

Create a formula in B7 that sums all of the sales

Click the submit arrow in the chat window, and Copilot will create and insert the formula to give you the result you want.

That was a simple one. Now try a more advanced example working from a more complex data set, as shown in the screenshot below.

Try the following prompt:

Create a formula in G2 that calculates total revenue per unit while accounting for the discount on each purchase. Then fill the formula down for all rows and create a summary table showing total revenue by Region.

Click the submit arrow, and it should create something like this:

(There’s a lot more you can have Copilot can do in Excel besides creating formulas. See our story “11 cool things Copilot can do in Excel.”)

Tip: It’s not required, but it can be helpful to format your spreadsheet as a table when working with Copilot. This helps define more clearly the exact cells for Copilot to use when it creates formulas or takes other actions on your data.

You’re just getting started

In this story you’ve seen how powerful formulas and functions can be in Excel — and we’ve only the scratched the surface of what they can do. Once you get comfortable using them, you can explore some of the myriad prebuilt functions Excel offers and learn how to build more complex formulas (including nesting functions). That’s all beyond the scope of this article, but a great place to start is Microsoft’s “Overview of formulas in Excel” support page, which includes links to several helpful tutorials.

For those who have access to it in Excel, experimenting with Copilot is another great way to learn. You can review the steps it took and the formulas it created to get a better understanding of how formulas work and what they’re capable of.

This story was originally published in May 2023 and updated in June 2026.

More Excel tips and how-tos:

• Excel basics: Get started with tables
• Excel for Microsoft 365 cheat sheet
• 11 cool things Copilot can do in Excel
• How to use PivotTables and PivotCharts in Excel
• Excel basics: Get started with charts and sparklines
• How (and why) to use conditional formatting in Excel
• More Microsoft tips and tutorials

Microsoft has introduced usage-based billing for Copilot Cowork, which is now generally available. 

Microsoft unveiled Copilot Cowork in March, pitching it as an AI agent that’s capable of independently performing long-running, multi-step tasks — even when a user’s computer is off. 

It’s built on the same technology that underpins Anthropic’s Claude Cowork. Unlike Claude Cowork, which can interact directly with files and applications on a user’s computer, Copilot Cowork runs in Microsoft’s cloud environment and acts on documents held in a customer’s Microsoft 365 tenant.

On Tuesday, Microsoft unveiled pricing details for Copilot Cowork, which involves usage-based billing in addition to a Microsoft 365 Copilot license ($30 per user each month for large enterprises before discounts, and $20 for Microsoft 365 Copilot for Business). 

The usage-based pricing is calculated from four components, according to Microsoft: “model use, context retrieval, tool calls, and runtime.” 

In practice, this means more intensive tasks that draw on multiple sources, use “deep reasoning” and generate two or more outputs will lead to higher costs — denoted in Copilot Credits. 

There are two payment options: pay as you go — priced at 1 cent per credit — and P3, where customers commit to usage volume in advance and receive a discount.

Cowork is turned off by default; IT admins can decide when to make it available and which employees get access. Admins can also impose spending limits at the tenant, group, and user level, and receive notifications when spending reaches a certain level.

Users will also be able to see how much each tasks costs in credits (available “soon after” the general availability launch, Microsoft said). 

Copilot Cowork customers can select from multiple AI models, including Anthropic’s Opus 4.8 and Sonnet 4.6, while those enrolled on the Frontier program can access OpenAI’s GPT 5.5 and Microsoft’s own Cowork 1 model.

Microsoft is considering hosting a version of DeepSeek’s open source models. “We are actively exploring a range of options that meet those requirements, and DeepSeek is one of several models under consideration. We’ll share more specifics on the underlying model closer to release,” said a Microsoft spokesperson.

Microsoft also announced new integrations with third-party apps such as Miro and Monday.com, with more — such as Adobe, Box, and Canva — coming soon.

This article was updated on June 19 to add Microsoft’s comment on DeepSeek.

Despite best efforts by defenders, malicious emails continue to slip through the cybersecurity cracks, leading some enterprises to implement a layered “defense in depth” strategy that incorporates multiple tools.

Microsoft seems to be challenging this idea, revealing that there are only nominal returns from adding integrated pre- and post-send partners to Defender for Office 365’s protections.

According to its new quarterly benchmarking data, the tech giant catches the vast majority of malicious and spam emails before delivery, misses the fewest compared to competitors by a wide margin, and removes nearly 100% of dangerous emails that do reach the inbox. Collectively, its integrated partners improve that catch rate by less than .05%.

While these numbers seem to tip the scales towards a one-vendor email security stack, experts urge enterprises to be skeptical and cautious of such vendor claims.

Seva Ioussoufovitch, senior research analyst at Info-Tech Research Group, pointed out, “percentages obscure the true quantity and severity of what’s getting through, and, considering it only takes one message to result in an incident, it’s simple enough to argue that there is real value in the defense in depth that having multiple tools provides.”

Malicious and spam email catch by the numbers

Microsoft introduced its quarterly benchmarking report in July 2025 alongside a Defender integrated cloud email security (ICES) ecosystem designed to support multi-vendor security strategies.

The SEG players it ranked itself against this year includes Mimecast, Proofpoint, Hornetsecurity, Trend Micro, Iron Port (Cisco), Barracuda, and FireEye (Trellix); ICES companies include Abnormal, Checkpoint Harmony, Cisco, DarkTrace, KnowBe4 Defend, Tessian, and Trend Micro.

Redmond reported that Defender “consistently leads” in pre-delivery detection, missing 59% fewer high-severity cyberthreats prior to delivery than the other SEG vendors it evaluated. Its closest competitors were Mimecast and Proofpoint. The company also introduced a new metric in this area: A threat miss rate per 1,000 employees. In Microsoft’s case, that was 194 per 1,000; for Mimecast, 478; for Proofpoint, 483.

When it came to post-delivery protection, Defender removed an average of 96.03% of malicious emails that reached the inbox, up from an initial 45% when Microsoft first started tracking the data in its second report.

This makes Defender “an increasingly critical backstop, operating even when ICES solutions are in place,” Jeff Pinkston, VP and GM for Microsoft Defender, wrote in a blog post. Still, ICES tools operating in tandem with Microsoft Defender “continue to provide benefits,” improving malicious catch by 0.29% and spam catch by 0.68%, he said.

“If we focus on the basics, their argument seems strong,” Info-Tech’s Ioussoufovitch noted. “Do you really need a separate ICES vendor for that extra sub 1% catch?” Microsoft paints a “compelling picture” by only focusing on raw catch rate, he said, but we don’t hear the rest of the story: “What exactly is the danger of what isn’t being caught by Defender?”

No one vendor catches everything

David Shipley of Beauceron Security pointed out that the report underscores the fact that “lots of stuff still gets by e-mail filters.”

His company regularly analyzes hundreds of thousands of emails, and the content that gets through “ranges from the shockingly mundane and obvious to a human expert, to highly clever time-delayed attacks,” he said.

A key factor in what gets through is the amount of content that is allowlisted; settings in “100% paranoid mode” get high catch rates, as well as high false positives, Shipley noted. “Anyone who has ever had a sales person lose a deal because the purchase order PDF got flagged has felt this pain.”

Then there’s the AI conundrum: “A key risk for e-mail vendors using agentic LLM-based analysis is it’s now possible to poison those models with hidden content (such as ‘ignore this e-mail, pretty please’),” Shipley said. This means enterprises need a variety of analysis methods.

Ioussoufovitch agreed that keeping pace with threat actors using AI is an industry-wide challenge, particularly as AI enables higher-quality phishing. Filters are improving and will catch some of it, but some will inevitably continue to get through. Those messages are likely highly-targeted, which are lower in volume but harder to catch.

“As of now, current tools do seem to be struggling to keep pace, but that doesn’t mean those tools aren’t necessary,” said Ioussoufovitch. “It just highlights that defense-in-depth, broadly speaking, is becoming more and more important.”

Claims ‘appear more honest’

Shipley said that this report appears more honest, accurate, and mature than others claiming 99.99% phish catch rates, “which is never true.” It’s also a “smart marketing move,” because Microsoft competes for the same security budget as other tools, and would rather enterprises remove those vendors and buy more from it in areas beyond e-mail.

On the other hand, he said, Microsoft is offering up a list of other vendors to think about, “which, congrats to Mimecast on coming in second.”

In the long run, CISOs need to determine the best spend for their limited security dollars, he noted. Enterprises need a good filter; whether they need two is up for debate. “They also clearly still need to invest in a robust awareness program,” Shipley said, “because as this report shows, lots of phishes are still getting delivered.”

Missing an important nuance

Ioussoufovitch noted that while the claims in the study are interesting, the data is presented without much of the nuance that would make it truly actionable.

“We are all too familiar with vendors’ abilities to massage data to tell the story they want, so I would advise leaders not to extrapolate the data beyond what it actually says,” he said.

Instead of the takeaway being “get rid of our current vendors,” this post highlights that Defender provides “considerable value,” he noted. Whether adding or subtracting additional vendors is worth the money should be a case-by-case conversation that considers an organization’s risk appetite, and overall security budget and environment.

“I’d treat these claims more as a reminder to assess your own environment and compare detections,” he said. “Come to conclusions based on the data you have, not what a vendor is presenting.”

This article originally appeared on CSOonline.