January 24, 2026—KB5078129 (OS Builds 19045.6812 and 19044.6812) Out-of-band

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.

Windows updates do not install Microsoft Store application updates. If you are an enterprise user, see Microsoft Store apps - Configuration Manager. If you are a consumer user, see Get updates for apps and games in Microsoft Store.

Summary

This article lists the fixes and quality improvements included in this out-of-band update.

Applies to: Windows 10 ESU

Important: Use EKB KB5015684 to update to Windows 10, version 22H2.

This out-of-band update includes fixes and improvements that are a part of the following updates:

The following is a summary of the key issues that this update addresses when you install this update. The bold text within the brackets indicates the item or area of the change we are documenting.

[File System] Fixed: After installing the Windows update released on and after January 13, 2026, some applications became unresponsive or encountered 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.

If you installed earlier updates, only the new updates contained in this package will be downloaded and installed on your device.

For more information about security vulnerabilities, please refer to the new Security Update Guide website and the January 2026 Security Updates.

For more information about Windows 10, version 22H2, see its update history page.

For information about Windows update terminology, see the article about the types of Windows updates and the monthly quality update types.

Note Follow @WindowsUpdate to find out when new content is published to the Windows release health dashboard.

Known issues in this update

We are currently not aware of any issues with this update.

Windows 10 servicing stack update (KB5068780) - 19044.6575 and 19045.6575

Microsoft now combines the latest servicing stack update (SSU) for your operating system with the latest cumulative update (LCU). SSUs improve the reliability of the update process to mitigate potential issues while installing updates.

This update makes quality improvements to the servicing stack, which is the component that installs Windows updates. To learn more about SSUs, see Servicing stack updates and Servicing Stack Updates (SSU): Frequently Asked Questions.

This servicing stack update (SSU) includes enhanced logic to verify whether a device is hosted on Azure, leveraging an updated certificate chain for validation.

To ensure seamless installation of future updates on Azure-hosted devices, it is strongly recommended to install this latest SSU prior to applying any additional updates.

Additionally, please ensure that the device can access the required certificate update domains to successfully download and install certificate updates. For more information, refer to:
- Certificate downloads and revocation lists
- Azure Certificate Authority details

How to get this update

Before you install this update

Important You must have the latest servicing stack update (SSU) installed. Not installing the latest SSU before applying Windows updates might result in the Windows update not being offered until the latest SSU is installed.

Based on your installation scenario, choose one of the following:

For offline OS image servicing:

If your image does not have the July 25, 2023 (KB5028244) or later LCU, you must install the special standalone October 13, 2023 SSU (KB5031539) before installing this update.
For Windows Server Update Services (WSUS) deployment or when installing the standalone package from Microsoft Update Catalog:

If your devices do not have the May 11, 2021 (KB5003173) or later LCU, you must install the special standalone August 10, 2021 SSU (KB5005260) before installing this update.

Install this update

To install this update, use one of the following release channels.

Available	Next Step
	See the other release channels.

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

A list of the files that are included in this update are provided in a CSV (Comma delimited) (*.csv) file. The file can be opened in a text editor such as Notepad or in Microsoft Excel.

Download Icon Download the file information for this out-of-band update KB5078129 now.