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Windows 11 Windows 11 Insider 25H2 Insider Preview, Beta Channel
Windows Insider

Build 26220.8764

Build 26220.8764: Windows Insider Beta Channel, July 2026. Driver, .NET and firmware updates align to one monthly restart

In short

Build 26220.8764 for the Beta Channel coordinates driver, .NET and firmware updates with the monthly quality update, adds three Voice Access languages and fixes an Outlook close-button issue.

Does it affect you? Applies to: Devices enrolled in the Windows Insider Program in the Beta Channel. This build is based on Windows 11, version 25H2, via an enablement package.

Build
26220.8764

This is a test build for people in the Windows Insider Program. Features in it can change, be removed, or never reach regular Windows releases.

What changes

Improvements 3 changes

Windows Update

For: Insiders in the Beta Channel

  • Driver, .NET and firmware updates are coordinated with the monthly quality update, reducing the update experience to a single monthly restart.1

Voice Access

For: Insiders in the Beta Channel who use Voice Access

  • Voice Access supports Portuguese (Portugal), Portuguese (Brazil) and Korean (South Korea).2

Fonts

For: Insiders in the Beta Channel who use Mongolian Baiti

  • Mongolian Baiti text appears more accurately and consistently when using Mongolian script.3
    Improves Mongolian Baiti shaping and rendering behavior.

Fix 1 change

Outlook

  • Outlook responds to the close button again.4

Technical details

Data sheet · Security · Downloads · Components Click to collapse or expand

Data sheet

Released
2026-07-06
Type
Windows Insider build
VersionBuildChannel
— 26220.8764 Beta Channel

Security

No vulnerabilities are listed for this update.

Sources

Updated
Cited passages from Microsoft's official notes (4)
  1. 1. We are starting by coordinating driver, .NET, and firmware updates to align with the monthly quality update, reducing the update experience to a single monthly restart. learn.microsoft.com
  2. 2. Voice Access now supports Portuguese (Portugal), Portuguese (Brazil), and Korean (South Korea). learn.microsoft.com
  3. 3. Improved Mongolian Baiti shaping and rendering behavior to ensure accurate and consistent text output, increasing text fidelity for Mongolian script. learn.microsoft.com
  4. 4. If you were having issues with Outlook not responding to the close button last week, that should be addressed now. learn.microsoft.com
Checked automatically: 8 of 8 checks passed, 4 quoted passages
  • Quotes found in the official pages: passed
  • Numbers found in the sources: passed
  • Vulnerabilities from the dossier only: passed
  • Links to allowed domains only: passed
  • Every official change covered: passed
  • Readable plain text: passed
  • Changes confirmed by the file list: passed
  • Sources agree: passed

A second AI read the text against the sources: correctness 4/5, clarity 5/5, completeness 5/5. How we work

Published by The Update Bureau. Written with AI from Microsoft's own documents, checked by rules and a second AI. How we work · Report a mistake