UPDATE 3/21:
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To view the latest updates about this release, visit the Windows release health dashboard or the update history page for Windows 11, version 25H2 and 24H2.
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For more information about security vulnerabilities, see the Security Update Guide and the March 2026 Security Updates.
Symptom
After installing this update, you might experience an issue signing into apps with a Microsoft account. Even when the device has a working internet connection, an error might appear during sign in that indicates a lack of internet connection and prevents access to Microsoft services and apps such as Microsoft Teams Free and OneDrive.
Note: Only sign ins using Microsoft accounts are affected. Businesses using Microsoft Entra ID for app authentication will not experience this issue.
Other applications affected include, but are not limited to, Microsoft Edge, Excel, Word, and Microsoft 365 Copilot. Whenever a feature in these applications requires signing into a Microsoft account, a similar error message can be encountered.
Workaround
This issue occurs when the device enters a specific network connectivity state and might resolve on its own. If you encounter this issue, restart the device while keeping it connected to the internet. This should repair the device connectivity state and prevent the issue from occurring.
Warning: If the device is restarted without an active internet connection, it might return to a connectivity state where the issue can occur again.
Microsoft is working to release a resolution for this issue in the next few days. Additional information will be shared as soon as it becomes available.
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 and Servicing Stack Updates (SSU): Frequently Asked Questions.
Install this update
To install this update, use one of the following Windows and Microsoft release channels.
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 5079473.
For a list of the files provided in the servicing stack update, download the file information for the SSU (KB5083532) - version 26100.8035.
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KB5085516 Out-of-band Update build 26100.8039 (24H2) and 26200.8039 (25H2) - March 21
Microsoft Support: March 21, 2026 - KB5085516 (OS Builds 26200.8039 and 26100.8039) Out-of-band This out-of-band update for Windows 11, version 25H2 and 24H2 (KB5085516) is cumulative. It includes updates from previous security and non-security releases, along with an additional fix. To learn...
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Microsoft Support:
March 10, 2026 - KB5079473 (OS Builds 26200.8037 and 26100.8037)
This cumulative update for Windows 11, version 25H2 and 24H2 (KB5079473), includes the latest security fixes and improvements, along with non-security updates from last month’s optional preview release. 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 25H2 and 24H2.
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.
Updating Microsoft Secure Boot keys before expiration in June 2026
UPDATE 4/02: https://support.microsoft.com/en-us/topic/secure-boot-certificate-update-status-in-the-windows-security-app-5ce39986-7dd2-4852-8c21-ef30dd04f046 UPDATE 2/10: https://www.elevenforum.com/t/refreshing-the-root-of-trust-industry-collaboration-on-secure-boot-certificate-updates.44460/...
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Change log
| Change date | Change description |
|---|---|
| March 19, 2026 | Known issue added: "Signing in with a Microsoft account might fail for Microsoft Teams Free and other apps" |
| March 10, 2026 | This update does not include any changes. |
Improvements
This security update contains fixes and quality improvements from KB5077181 (released February 10, 2026). The following summary outlines key issues addressed by this update. Also, included are available new features. The bold text within the brackets indicates the item or area of the change.- [Secure Boot] With this update, Windows quality updates include additional high confidence device targeting data, increasing coverage of devices eligible to automatically receive new Secure Boot certificates. Devices receive the new certificates only after demonstrating sufficient successful update signals, maintaining a controlled and phased rollout.
- [File Explorer] Improved: This update improves File Explorer search reliability when searching across multiple drives or "This PC".
- [Windows Defender Application Control] Improved: This update improves how Windows Defender Application Control (WDAC) handles COM objects allowlisting policies. COM objects were blocked when the endpoint security policy was set higher than the allowlisting policy. With this update, COM objects are allowed as expected.
- [Windows System Image Manager] Improved: This update improves the reliability of choosing trusted catalog files. It adds a warning dialog that helps you confirm that the file you select comes from a trusted source.
For more information about security vulnerabilities, see the Security Update Guide and the March 2026 Security Updates.
AI Components
This release updates the following AI components:| AI Component | Version |
|---|---|
| Image Search | 1.2602.1451.0 |
| Content Extraction | 1.2602.1451.0 |
| Semantic Analysis | 1.2602.1451.0 |
| Settings Model | 1.2602.1451.0 |
Windows 11 servicing stack update (KB5083532)- 26100.8035
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
1 Signing in with a Microsoft account might fail for Microsoft Teams Free and other apps
Symptom
After installing this update, you might experience an issue signing into apps with a Microsoft account. Even when the device has a working internet connection, an error might appear during sign in that indicates a lack of internet connection and prevents access to Microsoft services and apps such as Microsoft Teams Free and OneDrive.
Note: Only sign ins using Microsoft accounts are affected. Businesses using Microsoft Entra ID for app authentication will not experience this issue.
Other applications affected include, but are not limited to, Microsoft Edge, Excel, Word, and Microsoft 365 Copilot. Whenever a feature in these applications requires signing into a Microsoft account, a similar error message can be encountered.
Workaround
This issue occurs when the device enters a specific network connectivity state and might resolve on its own. If you encounter this issue, restart the device while keeping it connected to the internet. This should repair the device connectivity state and prevent the issue from occurring.
Warning: If the device is restarted without an active internet connection, it might return to a connectivity state where the issue can occur again.
Microsoft is working to release a resolution for this issue in the next few days. Additional information will be shared as soon as it becomes available.
How to get this update
Before you install this updateMicrosoft 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 and Servicing Stack Updates (SSU): Frequently Asked Questions.
Install this update
To install this update, use one of the following Windows and Microsoft release channels.
| Available | Next Step |
|---|---|
| This update downloads and installs automatically from Windows Update and Microsoft Update. |
Arm64 instructionsBefore 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 KB5079473 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-KB5079473-arm64.msuOr, run the following command from an elevated Windows PowerShell prompt: Add-WindowsPackage -Online -PackagePath "c:\packages\Windows11.0-KB5079473-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-KB5079473-arm64.msuOr, run the following command from an elevated Windows PowerShell prompt: Add-WindowsPackage -Path "c:\offline" -PackagePath "Windows11.0-KB5079473-arm64.msu" -PreventPendingMethod 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:
x64 instructionsBefore 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 KB5079473 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-KB5079473-x64.msuOr, run the following command from an elevated Windows PowerShell prompt: Add-WindowsPackage -Online -PackagePath "c:\packages\Windows11.0-KB5079473-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-KB5079473-x64.msuOr, run the following command from an elevated Windows PowerShell prompt: Add-WindowsPackage -Path "c:\offline" -PackagePath "Windows11.0-KB5079473-x64.msu" -PreventPendingMethod 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:
|
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 5079473.
For a list of the files provided in the servicing stack update, download the file information for the SSU (KB5083532) - version 26100.8035.
Source:
March 10, 2026—KB5079473 (OS Builds 26200.8037 and 26100.8037) - Microsoft Support
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