Win Update KB5079391 Windows 11 Cumulative Update Preview build 26100.8116 (24H2) and 26200.8116 (25H2) - March 26

UPDATE 3/31:

March 26, 2026 - KB5079391 (OS Builds 26200.8116 and 26100.8116) Preview​

This non-security update for Windows 11, version 25H2 and 24H2 (KB5079391), incudes production-quality improvements. To learn more about differences between security updates, optional non-security preview updates, Out-of-band (OOB) updates, and continuous innovation, see Windows monthly updates explained. For information on Windows update terminology, see the different types of Windows software updates.

To view the latest updates about this release, visit the Windows release health dashboard or the update history page for Windows 11, version 24H2 and version 25H2.

Announcements and messages​

This section provides key notifications related to this release, including announcements, change logs, and end-of-support notices.

Windows Secure Boot certificate expiration​

Important: Secure Boot certificates used by most Windows devices are set to expire starting in June 2026. This might affect the ability of certain personal and business devices to boot securely if not updated in time. To avoid disruption, we recommend reviewing the guidance and taking action to update certificates in advance. For details and preparation steps, see Windows Secure Boot certificate expiration and CA updates.

Change log​

Highlights​

This update is available through two release phases: gradual rollout and normal rollout. A gradual rollout delivers an update in phases, so features reach devices over time instead of all at once, meaning availability varies by device. A normal rollout is the broad release to all eligible devices at the same time, usually when it reaches general availability (GA).

Gradual rollout
The following summary outlines features from AI-powered Windows 11 PC experiences, along with improvements and fixes. The bold text within the brackets indicates the item or area of the change.

Windows 11 PC experiences​

This section highlights some new features and enhancements for Windows 11 PCs, including AI-powered capabilities, continuous innovation, and performance improvements.

• [Narrator] New! 1 Narrator provides rich image descriptions on Copilot+ PCs and now works with Copilot on all Windows 11 devices. Press Narrator key + Ctrl + D to describe the focused image or Narrator key + Ctrl + S to describe the full screen. Copilot opens with the image ready, allowing you to enter a prompt for a customized description. The image is shared only after you choose to describe it. On Copilot+ PCs, Narrator gives instant, on‑device descriptions, and you can select Ask Copilot for more detail.
  
  
  

  Turn On or Off Narrator in Windows 11

  This tutorial will show you how to turn on or off Narrator for your account in Windows 11. Narrator is a screen reader included with Windows 11 that describes what's on your screen. Narrator lets you use your PC without a mouse to complete common tasks if you’re blind or have low vision. It...

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• [Smart App Control] New! You can 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. To learn more, see App & Browser Control in the Windows Security App. This feature was previously disclosed in January 2026 (KB5074105) and is now beginning to roll out.
  
  
  

  Turn On or Off Smart App Control in Windows 11

  This tutorial will show you how to manually turn on or off Smart App Control in Windows 11. Smart App Control (SAC) is a new security feature starting with Windows 11 build 22567. Smart App Control can work alongside your other security software, such as Microsoft Defender, for added...

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• [Account Settings]
  • New! Microsoft 365 Family subscribers can upgrade to a different Microsoft 365 plan from Settings > Accounts. To remove the upgrade option, turn off Suggested content in Settings.
    
    
    

    Enable or Disable Suggested Content in Settings in Windows 11

    This tutorial will show you how to turn on or off show suggested content in the Settings app for your account in Windows 11. Microsoft can offer you suggestions throughout Settings. This content comes in a variety of forms, and can help you discover new features within Settings, or suggest new...

    www.elevenforum.com
  • New! This update improves the design of the dialog boxes in Settings > Accounts > Other users to match the modern Windows look and support dark mode. The visibility of the dialog box option depends on whether the device has a domain joined work or school account.
• [Input] New! The Pen settings page includes refinements to the pen tail button options. The new “Same as Copilot key” option enables the pen tail button to open the same app as the Copilot key.
  
  
  

  Change what Pen Shortcut Button Does in Windows 11

  This tutorial will show you how to change what your pen shortcut button does when you single-click, double-click, or press and hold the shortcut button for your account in Windows 11. You can pair a pen via Bluetooth to connect the pen with your Windows 11 PC and use with the pen menu. You can...

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• [Settings]
  • New! The Settings About page (Settings > About) has been improved to provide a more structured and intuitive experience, offering clearer device specifications and easier navigation to related device components, including quick access to Storage settings.
  • New! 2 The device information card on the Settings Home page simplifies key device specifications and improves consistency across the end-to-end flow from the Home Card to the Settings > System > About page, making information easier to scan and understand.
    
    
    

    Add or Remove Settings Home page in Windows 11

    This tutorial will show you how to add or remove the Home page in Settings for all users in Windows 11. Starting with Windows 11 version 22H2 KB5030310 Build 22621.2361, Microsoft is introduced a new homepage in Settings that offers you a dynamic and personalized experience. It provides an...

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  • This update improves the reliability and performance of opening the Home in Settings.
  • This update improves the reliability of downloading required updates when you’re prompted in Settings > System > Advanced.
• [File Explorer] This update improves the File Explorer experience.
  • You can more reliability unblock files downloaded from the internet in order to preview them in File Explorer.
    
    
    

    Unblock File Downloaded from Internet in Windows 11

    This tutorial will show you different ways on how to unblock files downloaded from the Internet depending on how they were blocked in Windows 11. When you download files from the Internet, Windows 11 shows you a security warning every time you try to open it by default. Some file types are...

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  • You can use Voice Typing (Windows logo key + H) when renaming a file in File Explorer.
    
    
    

    Rename File in Windows 11

    This tutorial will show you different ways to rename a file to what you want in Window 11. A file name can't contain any of the following characters: \ / : * ? " < > | If you rename more than one file at the same time, the name of each file will be the same and numbered in order like: new file...

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  • You can now sort the permissions entries in the Advanced Security Settings window for a folder in File Explorer by Principal.
• [Display] This update includes Display reliability improvements.
  • Monitors can now report refresh rates higher than 1000 Hz.
  • When you use a native USB4 monitor connection, the USB controller can now enter its lowest power level while the PC is sleeping, which helps save battery life.
  • Auto rotation reliability has improved after resuming from sleep.
  • HDR reliability has improved for displays with non-compliant DisplayID 2.0 blocks.
  • Monitors with DisplayID now report a more accurate size when the WMI monitor APIs are used.
• [Printing] Updated downlevel baseline support for printer connections to be Windows 10, version 1607 and Windows Server 2016 (Build 14393).
• [Safe mode] This update improves the reliability of loading taskbar components in safe mode.
• [Voice Access] This update improves how numbers are detected and written when using Voice Access in English.
• [Start menu] This update improves the reliability of applying the Start menu layout through Group Policy when desktopAppLink is present in the JSON.
• [Remote Desktop] The Set-RDSessionCollectionConfiguration PowerShell command now recognizes DisableSeamlessLanguageBar.