March 26, 2026—KB5079391 (OS Builds 26200.8116 and 26100.8116) Preview
Applies To
Release Date:
26/03/2026
Version:
OS Builds 26200.8116 and 26100.8116
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.
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).
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.
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.
-
[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.
-
[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.
-
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.
-
[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.
-
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.
-
You can use Voice Typing (Windows logo key + H) when renaming a file in File Explorer.
-
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.
-
[Audio] This update improves how short MIDI messages are handled in cases where an application is initialized without providing long message buffers.
-
[System File Checker] This update removes an extraneous error message you might unexpectedly see when running sfc /scannow.
-
[Windows Hello] This update improves Windows Hello Fingerprint reliability for certain devices.
1 Functionality will vary by device and market.
2 Availability will vary by device and market.
This non-security update includes quality improvements. The following summary outlines key issues addressed by the KB update after you install it. Also, included are available new features. The bold text within the brackets indicates the item or area of the change.
-
[Application Control for Business] Improved: This update improves Application ID tagging in Application Control for Business policies. With this update, the system identifies which apps should receive tags more accurately and behaves more reliably.
-
[Narrator] This update improves the Natural Voices experience in Narrator. It also makes Natural Voices setup more reliable.
-
[Performance & Reliability] This update improves stability in Windows Recovery Environment (Windows RE) when you run x64 apps on ARM64 devices. These apps run more smoothly and respond as expected.
-
[Windows Update Deployment (known issue)] Fixed: This update addresses an issue in Windows 11, version 25H2, where updates installed using the Windows Update Standalone Installer (WUSA) might fail with error code ERROR_BAD_PATHNAME. This issue can occur when you double-click a .msu file or run WUSA from a network share that contains multiple .msu files.
If you installed earlier updates, your device downloads and installs only the new updates contained in this package.
AI Components
This release updates the following AI components:
|
AI Component |
Version |
|
Image Search |
1.2603.377.0 |
|
Content Extraction |
1.2603.377.0 |
|
Semantic Analysis |
1.2603.377.0 |
|
Settings Model |
1.2603.377.0 |
Windows 11 servicing stack update (KB5079387)- 26100.8112
This update makes quality improvements to the servicing stack, which is the component that installs Windows updates. Servicing stack updates (SSU) ensure that you have a robust and reliable servicing stack so that your devices can receive and install Microsoft updates. To learn more about SSUs, see Simplifying on-premises deployment of servicing stack updates.
Known issues in this update
Microsoft is not currently aware of any issues with this update.
How to get this update
Before you install this update
Microsoft combines the latest servicing stack update (SSU) for your operating system with the latest cumulative update (LCU). For general information about SSUs, see Servicing stack updates.
Install this update
To install this update, use one of the following Windows and Microsoft release channels.
|
Available |
Next Step |
|
|
|
Open Start > Settings Update & Security > Windows Update. In the Optional updates available area, you will find the link to download and install available updates. |
|
Available |
Next Step |
|
|
These changes will appear in the next security update to Windows Update for Business. |
|
Available |
Next Step |
|
|
To install this release from the Microsoft Update Catalog, select the option that matches your device architecture (arm64 or x64), and then follow the instructions. |
Before you install this update, the standalone package(s) for this update is available from the Microsoft Update Catalog website. This KB contains one or more MSU files that require installation in a specific order.
You can install this update using Method 1 (install all MSU files together) or Method 2 (install each MSU file individually, in order).
Method 1: Install all MSU files together
Download all MSU files for KB5079391 from Microsoft Update Catalog and place them in the same folder (for example, C:/Packages). Use Deployment Image Servicing and Management (DISM.exe) to install the target update. DISM will use the folder specified in PackagePath to discover and install one or more prerequisite MSU files as needed.
Updating Windows PC
To apply this update to a running Windows PC, run the following command from an elevated Command Prompt:
|
DISM /Online /Add-Package /PackagePath:c:\packages\Windows11.0-KB5079391-arm64.msu |
Or, run the following command from an elevated Windows PowerShell prompt:
|
Add-WindowsPackage -Online -PackagePath "c:\packages\Windows11.0-KB5079391-arm64.msu" |
Or use Windows Update Standalone Installer to install the target update.
Updating Windows Installation media
To apply this update to Windows Installation media, see Update Windows installation media with Dynamic Update.
Note: When downloading other Dynamic Update packages, ensure they match the same month as this KB. If the SafeOS Dynamic Update or Setup Dynamic Update is not available for the same month as this KB, use the most recently published version of each.
To add this update to a mounted image, run the following command from an elevated Command Prompt:
|
DISM /Image:mountdir /Add-Package /PackagePath:Windows11.0-KB5079391-arm64.msu |
Or, run the following command from an elevated Windows PowerShell prompt:
|
Add-WindowsPackage -Path "c:\offline" -PackagePath "Windows11.0-KB5079391-arm64.msu" -PreventPending |
Method 2: Install each MSU file individually, in order
Download and install each MSU file individually either using DISM or Windows Update Standalone Installer in the following order:
-
windows11.0-kb5043080-arm64_df540a05f9b118e339c5520f4090bb5d450f090b.msu
-
windows11.0-kb5079391-arm64_8a21a1618615fd6b461924a8e5ec5e382e95dd46.msu
|
Note: This latest cumulative update includes updates for AI components. Even though the AI component updates are included in the update, the AI components are only applicable to Windows Copilot+ PCs and will not install on Windows PC or Windows Server. |
Before you install this update, the standalone package(s) for this update is available from the Microsoft Update Catalog website. This KB contains one or more MSU files that require installation in a specific order.
You can install this update using Method 1 (install all MSU files together) or Method 2 (install each MSU file individually, in order).
Method 1: Install all MSU files together
Download all MSU files for KB5079391 from Microsoft Update Catalog and place them in the same folder (for example, C:/Packages). Use Deployment Image Servicing and Management (DISM.exe) to install the target update. DISM will use the folder specified in PackagePath to discover and install one or more prerequisite MSU files as needed.
Updating Windows PC
To apply this update to a running Windows PC, run the following command from an elevated Command Prompt:
|
DISM /Online /Add-Package /PackagePath:c:\packages\Windows11.0-KB5079391-x64.msu |
Or, run the following command from an elevated Windows PowerShell prompt:
|
Add-WindowsPackage -Online -PackagePath "c:\packages\Windows11.0-KB5079391-x64.msu" |
Or use Windows Update Standalone Installer to install the target update.
Updating Windows Installation media
To apply this update to Windows Installation media, see Update Windows installation media with Dynamic Update.
Note: When downloading other Dynamic Update packages, ensure they match the same month as this KB. If the SafeOS Dynamic Update or Setup Dynamic Update is not available for the same month as this KB, use the most recently published version of each.
To add this update to a mounted image, run the following command from an elevated Command Prompt:
|
DISM /Image:mountdir /Add-Package /PackagePath:Windows11.0-KB5079391-x64.msu |
Or, run the following command from an elevated Windows PowerShell prompt:
|
Add-WindowsPackage -Path "c:\offline" -PackagePath "Windows11.0-KB5079391-x64.msu" -PreventPending |
Method 2: Install each MSU file individually, in order
Download and install each MSU file individually either using DISM or Windows Update Standalone Installer in the following order:
-
windows11.0-kb5043080-x64_953449672073f8fb99badb4cc6d5d7849b9c83e8.msu
-
windows11.0-kb5079391-x64_0a0129ebe88fdd66e19ac7d40d9cddd0b18c3332.msu
|
Note: This latest cumulative update includes updates for AI components. Even though the AI component updates are included in the update, the AI components are only applicable to Windows Copilot+ PCs and will not install on Windows PC or Windows Server. |
|
Available |
Next Step |
|
|
You can import this update into Windows Server Update Services (WSUS) manually. See the Microsoft Update Catalog for instructions. |
If you want to remove the LCU
Before you decide to remove the LCU, see Understanding the risks: Why you should not uninstall security updates.
To remove the LCU after installing the combined SSU and LCU package, use the DISM/Remove-Package command line option with the LCU package name as the argument. You can find the package name by using this command: DISM /online /get-packages.
Running Windows Update Standalone Installer (wusa.exe) with the /uninstall switch on the combined package will not work because the combined package contains the SSU. You cannot remove the SSU from the system after installation.
File information
For a list of the files provided in this update, download the file information for cumulative update 5079391.
For a list of the files provided in the servicing stack update, download the file information for the SSU (KB5079387) - version 26100.8112.
Related topics
Microsoft Store for Business and Education with Configuration Manager
Need more help?
Want more options?
Explore subscription benefits, browse training courses, learn how to secure your device, and more.
Communities help you ask and answer questions, give feedback, and hear from experts with rich knowledge.
