What's new in the Windows 11 Insider builds for 25 September 2026
- Build 26300.9032
- Windows 11, version 26H2
Maya Reyes3 min readQuick answer
The recent Windows 11 Insider preview releases focus on Build 26300.9032 for the Experimental channel, bringing features like activity-driven search indexing expansion, Phone Link notification previews in the Start menu, and an updated adaptive hibernate policy. This release also includes a critical flight certificate renewal and fixes for File Explorer, Start menu crashes, and SMB backups. Insiders can download the update directly through Windows Insider settings.
Microsoft continues testing early Windows features through preview releases in the Windows Insider Program. The latest developments focus on Experimental channel testing for Windows 11, version 26H2, headlined by Build 26300.9032. These updates deliver system-level enhancements, refined desktop features, and fixes for core OS components like File Explorer and the Start menu.
For users testing pre-release software, staying updated ensures continuous access to new features and keeps security certificates current. Build 26300.9032 includes an essential flight certificate renewal to keep devices on supported preview builds, alongside new tools like activity-based search indexing, hover previews for Phone Link in Start, and updated power management rules.
Highlights
- Flight certificate renewal: Contains a renewed Windows Insider flight certificate replacing the build certificate that expires on August 11, 2026, ensuring devices remain on supported builds and continue receiving future preview updates.
- Automatic search indexing: Windows Search can now automatically expand its indexing scope based on user activity, such as recent files and frequently accessed locations, managed under Settings > Privacy & security > Search.
- Phone Link message previews in Start: Users can hover over recent messages or notifications in the Recent section of the Start menu to preview content directly without opening the item or picking up their phone (requires Phone Link build 1.26021.3.0 or higher).
- Settings app search ranking: Enhances search in the Settings app by returning results from additional areas and improving ranking so relevant settings appear higher in results.
- Adaptive hibernate policy: Updates power management to increase instant-on resumes from Modern Standby and preserve battery life, reducing hibernation when battery level is above 80% and hibernating earlier when below 10%.
- File Explorer Home section persistence: File Explorer Home now remembers whether sections were expanded or collapsed so users can resume work where they left off.
- File Explorer stability and network fixes: Addresses an issue where clicking near the right end of the address bar cleared its contents, improves reliability when dragging files to disconnected network drives, and resolves a false internet warning and Mark of the Web issue on DFS mapped drives.
- Start menu and taskbar crash fixes: Resolves an issue that caused the Start menu to crash when dragging apps, and fixes a taskbar overflow bug where hovering over app preview thumbnails immediately dismissed them.
- File History SMB backup fix: Corrects an issue preventing File History automatic backups to Server Message Block (SMB) network shares caused by a false invalid credentials error.
- Windows Spotlight reliability: Implements underlying improvements to increase the reliability of Windows Spotlight on the lock screen.
Known issues
Microsoft reports no known issues for this update.
Should you install it?
Build 26300.9032 is aimed primarily at early adopters and tech enthusiasts enrolled in the Experimental channel of the Windows Insider Program. If you enjoy testing unreleased features—such as activity-driven search indexing, enhanced Start menu integrations with Phone Link, and optimized hibernation policies—installing this preview build offers early access to Microsoft's latest development work. Additionally, because flight certificates expire on August 11, 2026, active Insiders must update to Build 26300.9032 or a later release to maintain build support and keep receiving updates.
However, mainstream users who rely on their device for daily production or critical work should hold off. Preview builds in the Experimental channel carry variable stability and rough edges, and features tested in this branch may be altered, removed, or replaced before general availability. If you require absolute system stability, it is best to remain on retail builds of Windows 11.
How to get it
Illustration: the Windows Update page in Windows 11 Settings
- Open the Settings menu on your Windows 11 device.
- Select Windows Update from the sidebar navigation.
- Click on Windows Insider Program to verify your channel enrollment.
- Ensure your device is set to the Experimental channel (or adjust your channel settings under Choose your Insider settings).
- Return to the main Windows Update page and select Check for updates.
- Allow Windows Update to download and install Build 26300.9032, then restart your device when prompted.
Because pre-release Insider builds are delivered via Controlled Feature Rollouts and flighting paths, they are distributed directly through the Windows Insider Program in Windows Update rather than standalone executable packages on the Microsoft Update Catalog. Insiders can also manage optional preview toggles by navigating to Settings > Windows Update > Windows Insider Program > Feature flags.
Sources
Frequently asked questions
How do I check if my Windows 11 device is on Build 26300.9032?
You can check your current build by going to Settings > System > About or by pressing Windows Key + R, typing winver, and selecting OK.
What happens if I do not update before the flight certificate expires on August 11, 2026?
If your flight certificate expires, your device may stop receiving future Insider Preview updates and become stuck on an unsupported build, requiring a clean reinstallation of Windows 11.
Can I switch channels after installing Build 26300.9032?
Yes, if you are on the standard Windows 11 version 26H2 core, you can switch between Experimental, Beta, and Release Preview channels under Settings > Windows Update > Windows Insider Program.
Where can I manage feature flags in the Experimental channel?
You can manually toggle specific preview features on or off by navigating to Settings > Windows Update > Windows Insider Program > Feature flags.
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Covers Windows 11 update releases and the problems that follow them. Tracks Microsoft's release-health notes daily and flags known issues the same day they appear.
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