Applies To
Windows 11 version 23H2, all editions

Release Date:

1/17/2026

Version:

OS Build 22631.6494

Change date

Change description

January 24, 2026

  • Added a resolution to a known issue "Apps might become unresponsive when saving files to cloud-based storage"

January 21, 2026

  • Added the known issue "Apps might become unresponsive when saving files to cloud-based storage"

Summary

​​​​This out-of-band update for Windows 11, version 23H2 (KB5077797) is cumulative. It includes updates from previous security releases, along with an additional fix. 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 23H2. 

Improvements

This OOB update includes quality improvements. This update is cumulative and includes security fixes and improvements from the January 13, 2026, security update (KB5073455) in addition to the following:

After you install the January 2026 Windows security update (KB5073455), you might experience the following issues, which are resolved by this OOB update:

  • [Remote Desktop] Fixed: Some users experienced sign-in failures during Remote Desktop connections. This issue affected authentication steps for different Remote Desktop applications on Windows such as the Windows App.

  • [Power & Battery] Fixed: Some devices with Secure Launch enabled restart instead of shutting down or entering hibernation.

​​​​​​​​​​​​​​​​​​​If you installed earlier updates, your device downloads and installs only the new updates contained in this package.

Windows 11 servicing stack update (KB5071963) - 22621.6265

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

Symptom

After installing this update, some applications may become unresponsive or encounter unexpected errors when opening files from or saving files to cloud-based storage, such as OneDrive or Dropbox. In certain Outlook configurations that store PST files on OneDrive, Outlook may hang and fail to reopen unless the process is terminated or the system is restarted. Users may also see missing sent Items or previously downloaded emails being re‑downloaded.

Workaround

This issue is addressed in KB5078132. 

How to get this update

Before you install this update

​​​​​​​Microsoft now 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

Not included

See the Catalog option.

If you want to remove the LCU

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 5077797. 

For a list of the files provided in the servicing stack update, download the file information for the SSU (KB5071963) - versions 22621.6265. 

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