Microsoft released Windows 11 Insider Preview build 26220.8764 for version 25H2 in the Beta channel. The update reduces the number of restarts you see each month by combining driver, .NET, and firmware updates with the monthly quality update instead of installing them on separate schedules. Beyond the reboot changes, the build also expands Voice Access to three new languages, improves Mongolian Baiti font rendering, and fixes a bug that left Outlook unresponsive when closing the app.
What’s New in Build 26220.8764
This build brings four notable changes covering update behavior, accessibility, fonts, and app stability.
1. Unified Windows Update Experience
Microsoft is testing a new update model that combines driver, .NET, and firmware updates with the monthly quality update, cutting down the number of restarts you see each month.
Previously, Windows Update installed drivers, .NET updates, and firmware patches on separate schedules, each triggering its own restart. With this build, those components now align with the monthly cumulative update, so you handle everything in a single restart cycle instead of several scattered ones.
2. Voice Access Adds Three New Languages
Voice Access now supports Portuguese (Portugal), Portuguese (Brazil), and Korean (South Korea).
This expands Windows 11’s built-in voice control feature beyond its existing language list, letting more users control their PC hands-free using native speech recognition instead of third-party tools.
Mongolian Baiti Font Improvements
Microsoft improved Mongolian Baiti shaping and rendering to fix text fidelity issues.
The update corrects how the Mongolian Baiti font renders and shapes text, so documents and interface elements using the Mongolian script now display accurately and consistently instead of showing broken or misaligned characters.
Outlook Close Button Fix
The build resolves the issue where Outlook stopped responding when users clicked the close button.
This bug appeared in a previous update cycle and left Outlook frozen or unresponsive during shutdown. Build 26220.8764 addresses it directly, so closing the app should work as expected again.
How to Get Build 26220.8764
Follow these steps to install the build on your PC.
- Open Settings and go to Windows Update.
- Select Windows Insider Program and enroll your device in the Beta Channel.
- Return to Windows Update and turn on Get the latest updates as soon as they’re available.
- Click Check for Updates to download and install build 26220.8764.
If you prefer a clean install, you can download the ISO directly from the Windows Insider Preview Downloads page. Note that specific preview builds stay available for a limited time only.
What Causes These Changes
- Microsoft is piloting the unified update model to cut down on reboot fatigue reported by Insiders.
- Voice Access language expansion follows Microsoft’s ongoing accessibility rollout across regions.
- The Outlook and font fixes stem from bugs flagged through Feedback Hub in prior builds.
Frequently Asked Questions
Is build 26220.8764 available for all Windows 11 versions?
No. This build applies to Windows 11 version 25H2 through an enablement package, and it’s limited to devices enrolled in the Beta Channel of the Windows Insider Program.
Will the single-restart update model reach the stable channel?
Microsoft hasn’t confirmed a stable rollout date. Features tested in Insider builds sometimes change, get delayed, or never ship, so treat this as an early preview rather than a guaranteed future feature.
Does this build fix any security issues?
The official notes don’t list security fixes for this build. It focuses on update behavior, Voice Access languages, font rendering, and the Outlook close button bug.
Can I roll back after installing this build?
Yes, standard Insider Preview builds allow rollback through Windows Update recovery options, unlike some edition-upgrade features that are one-way only.
