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Windows 11 Windows 11 Insider 26H2 Insider Preview, Experimental Channel
Windows Insider

Build 26300.8772

Build 26300.8772: Windows Insider Experimental Channel, July 2026. Cloud rebuild, default settings backup and a taskbar search fix

In short

Experimental Channel Insiders get Cloud rebuild, default settings backup on eligible managed devices, and fixes for the vertical taskbar search icon and Outlook’s close button.

Does it affect you? Applies to: Devices enrolled in the Windows Insider Program’s Experimental Channel.

Build
26300.8772

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 7 changes

Search

Gradual rollout

For: Insiders on Experimental build 26300.8772

  • Several Windows Search Box improvements are rolling out to Insiders on this build.1
    Available via Controlled Feature Rollout.

Backup and restore on by default for commercial

Gradual rollout

For: Users and administrators of eligible Microsoft Entra joined devices

  • Windows settings backup and restore is enabled by default on eligible work or school devices joined to Microsoft Entra. It backs up user settings and the Microsoft Store app list; restoring remains opt-in and managed by administrators.2
    Applies starting in Windows 11, version 26H2, to eligible Microsoft Entra joined or Microsoft Entra hybrid joined devices. Existing policies apply, and explicit configurations override the default.

Account Control

Gradual rollout

For: Insiders in the Experimental Channel

  • The Account Control flyout has a refreshed design and a subscription badge that makes account status easier to see.3

Settings

Gradual rollout

For: Insiders in the Experimental Channel who use a gamepad

  • You can navigate the Bluetooth quick settings page using a gamepad.4

Run

Gradual rollout

For: Insiders who use screen readers

  • Screen readers announce keyboard focus more clearly when you use the new Run design.5

Fonts

Gradual rollout

For: Insiders who use Mongolian script

  • Mongolian text displays more accurately and consistently.6
    Improves Mongolian Baiti shaping and rendering for Mongolian script.

Title bar tooltips

Gradual rollout

For: Insiders in the Experimental Channel

  • Title bar tooltips use fewer resources over time.7

Fixes 2 changes

Taskbar

Gradual rollout

For: Insiders using a vertical taskbar

  • The search icon is visible when the taskbar is in a vertical position.8

Outlook

Gradual rollout

For: Insiders using Outlook

  • Outlook should now respond when you select the close button.9

New feature 1 change

Recovery

Gradual rollout

For: Insiders in the Experimental Channel

  • Cloud rebuild reinstalls Windows to a clean state, even if the PC will not boot. It downloads the Windows image and device drivers from Windows Update, so you do not need USB media or a custom image.10
    Start it in Windows Recovery Environment (WinRE) at Troubleshoot > Recovery and uninstall > Cloud rebuild.

Technical details

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

Data sheet

Released
2026-07-06
Type
Windows Insider build
VersionBuildChannel
26H2 26300.8772 Experimental Channel

Security

No vulnerabilities are listed for this update.

Sources

Updated
Cited passages from Microsoft's official notes (10)
  1. 1. Today, we’re rolling out several improvements to Windows Search Box which are available to Windows Insiders who are on Experimental build 26300.8772 via Controlled Feature Rollout. learn.microsoft.com
  2. 2. Starting in Windows 11, version 26H2, the backup policy of Windows settings backup and restore will be enabled by default on eligible Microsoft Entra joined or Microsoft Entra hybrid joined devices. learn.microsoft.com
  3. 3. The Windows 11 Account Control flyout has a refreshed, modern design and a clear subscription badge to make the user's account status instantly visible. learn.microsoft.com
  4. 4. The Bluetooth quick settings page is now navigable using gamepad input. learn.microsoft.com
  5. 5. Improved how keyboard focus is announced for screen readers when using the new Run design. learn.microsoft.com
  6. 6. Improved Mongolian Baiti shaping and rendering behavior to ensure accurate and consistent text output, increasing text fidelity for Mongolian script. learn.microsoft.com
  7. 7. Improved resource usage over time of title bar tooltips. learn.microsoft.com
  8. 8. Fixed issue where the search icon might be invisible when using the taskbar in a vertical position. learn.microsoft.com
  9. 9. If you were having issues with Outlook not responding to the close button last week, that should be addressed now. learn.microsoft.com
  10. 10. We're introducing Cloud rebuild, a new recovery option that restores a Windows 11 PC to a clean, known-good state by performing a full OS reinstall, even when Windows won't boot. learn.microsoft.com
Checked automatically: 8 of 8 checks passed, 10 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 5/5, clarity 4/5, completeness 4/5. 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