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Find information on known issues and the servicing status for Windows 10 Enterprise LTSC 2021 and Windows 10 IoT Enterprise LTSC 2021. For immediate help with Windows update issues, click here if you are using a Windows device to open the Get Help app or go to support.microsoft.com. Follow @WindowsUpdate on X for Windows release health updates. If you are an IT administrator and want to programmatically get information from this page, use the Windows Updates API in Microsoft Graph.
Current status as of May 2, 2025
Windows 10 Enterprise LTSC 2021 and Windows 10 IoT Enterprise LTSC 2021 will have mainstream support until January 12, 2027.
Windows 10, version 21H2 Home and Pro editions reached end of servicing on June 13, 2023. Education and Enterprise editions reached end of servicing on June 11, 2024. Devices running these editions do not receive security updates containing protections from the latest security threats.
As always, we recommend that you upgrade eligible devices to Windows 11. For information about servicing timelines and lifecycle, see Windows 11 release information, Windows 10 release information, Windows Lifecycle FAQ, and Microsoft Lifecycle Policy search tool.
Known issues
See open issues, content updated in the last 30 days, and information on safeguard holds. To find a specific issue, use the search function on your browser (CTRL + F for Microsoft Edge).
| Summary | Originating update | Status | Last updated |
|---|---|---|---|
| Some devices might fail to shut down or hibernate This issue affects some Secure Launch-capable PCs with Virtual Secure Mode enabled after installing Jan '26 updates. | OS Build 19044.6809 KB5073724 2026-01-13 | Confirmed | 2026-02-03 18:06 PT |
| Apps might become unresponsive when saving files to cloud-backed storage Affected apps include Outlook, which can become unresponsive when accessing PST files stored on Microsoft OneDrive. | OS Build 19044.6809 KB5073724 2026-01-13 | Resolved KB5078129 | 2026-01-24 14:06 PT |
| Connection and authentication failures in Azure Virtual Desktop and Windows 365 January 2026 Windows update causes Windows App credential prompt failures on Azure Virtual Desktop and Windows 365 | OS Build 19044.6809 KB5073724 2026-01-13 | Resolved KB5077796 | 2026-01-17 18:06 PT |
Issue details
January 2026
Some devices might fail to shut down or hibernate
| Status | Originating update | History |
|---|---|---|
| Confirmed | OS Build 19044.6809 KB5073724 2026-01-13 | Last updated: 2026-02-03, 18:06 PT Opened: 2026-01-15, 18:33 PT |
After installing Windows updates released on or after January 13, 2026 (KB5073724), some Secure Launch-capable PCs with Virtual Secure Mode (VSM) enabled are unable to shut down or enter hibernation. Instead, the device restarts. This issue does not affect devices with AMD or ARM64 processors and is limited to the affected platforms listed below.
Next steps: We plan to release a solution in a future Windows update. We will provide more information when it is available.
Affected platforms:
- Client: Windows 11, version 23H2; Windows 10, version 22H2; Windows 10 Enterprise LTSC 2021; Windows 10 Enterprise LTSC 2019
- Server: None
Apps might become unresponsive when saving files to cloud-backed storage
| Status | Originating update | History |
|---|---|---|
| Resolved KB5078129 | OS Build 19044.6809 KB5073724 2026-01-13 | Resolved: 2026-01-23, 14:00 PT Opened: 2026-01-20, 22:10 PT |
After installing Windows updates released on or after January 13, 2026 (KB5073724), some applications might become unresponsive or experience unexpected errors when opening files from or saving files to cloud-backed storage, such as OneDrive or Dropbox.
For example, in some configurations of Outlook that store PST files on OneDrive, Outlook might become unresponsive and fail to reopen unless its process is terminated in Task Manager, or the system is restarted. In addition, sent emails might not appear in the Sent Items folder, and previously downloaded emails might be downloaded again. The affected Outlook configurations primarily involve classic Outlook, which is commonly tied to enterprise licensing and is not included with most home installations of Windows. To check your Outlook configuration, see Feature comparison between new Outlook and classic Outlook.
Resolution:
This issue is resolved in the out-of-band (OOB) update KB5078129, released on January 24, 2026, and available via the Microsoft Update Catalog, as well as in updates released after this date. We recommend installing the latest update for your device, as it contains important improvements and issue resolutions, including this one.
Note: To download updates from the Microsoft Update Catalog, follow the steps described on this article.
For devices that have not yet installed the OOB update, there is an optional workaround for Outlook-specific scenarios. Moving the Outlook PST files out of OneDrive should resolve this issue. For guidance, please see documentation at How to remove an Outlook .pst data file from OneDrive. In addition, email accounts can still be accessed via webmail, if supported by your email provider.
Affected platforms:
- Client: Windows 11, version 25H2; Windows 11, version 24H2; Windows 11, version 23H2; Windows 10, version 22H2; Windows 10 Enterprise LTSC 2021; Windows 10 Enterprise LTSC 2019
- Server: Windows Server 2025; Windows Server, version 23H2; Windows Server 2022; Windows Server 2019
Connection and authentication failures in Azure Virtual Desktop and Windows 365
| Status | Originating update | History |
|---|---|---|
| Resolved KB5077796 | OS Build 19044.6809 KB5073724 2026-01-13 | Resolved: 2026-01-17, 14:00 PT Opened: 2026-01-14, 00:52 PT |
After installing the January 2026 Windows security update (KB5073724), credential prompt failures might occur in some remote connection applications. This includes remote desktop connections using the Windows App on Windows client devices, on Azure Virtual Desktop and Windows 365. The Windows App is affected by this issue on specific Windows builds and can experience sign-in failures.
Other remote connections and related applications may be similarly impacted.
Resolution: To address this issue, an out-of-band (OOB) update was released January 17, 2026, in the Microsoft Update Catalog. It can be found as KB5077796.
If you have not yet deployed the January 2026 Windows security update and your IT environment includes the affected applications and features, we recommend applying this OOB update instead. For additional guidance, see How to download updates from the Microsoft Update Catalog. As always, we recommend you install the latest update for your device as it contains important improvements and issue resolutions including this one.
If the OOB is not installed, one of the following connection options can be used as a temporary workaround:
- Use the Remote Desktop client for Windows to connect to Azure Virtual Desktop here (/previous-versions/remote-desktop-client/whats-new-windows?tabs=windows-msrdc-msi)
- Connect using the Windows App Web Client at windows.cloud.microsoft
Affected platforms:
- Client: Windows 11, version 25H2; Windows 11, version 24H2; Windows 11, version 23H2; Windows 10, version 22H2; Windows 10, version 21H2, Windows 10 Enterprise LTSC 2019
- Server: Windows Server 2025; Windows Server 2022; Windows Server 2019
Report a problem with Windows updates
To report an issue to Microsoft at any time, use the Feedback Hub app. To learn more, see Send feedback to Microsoft with the Feedback Hub app.
Need help with Windows updates?
Search, browse, or ask a question on the Microsoft Support Community. If you are an IT pro supporting an organization, visit Windows release health on the Microsoft 365 admin center for additional details.
For direct help with your home PC, use the Get Help app in Windows or contact Microsoft Support. Organizations can request immediate support through Support for business.
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