Applies To
Windows 10 Enterprise and Education, version 21H2 Windows 10 IoT Enterprise, version 21H2 Windows 10 Enterprise Multi-Session, version 21H2 Windows 10, version 22H2, all editions

Release Date:

2/13/2024

Version:

OS Builds 19044.4046 and 19045.4046

EXPIRATION NOTICE

IMPORTANT As of March 31, 2026, this update is no longer available from the Microsoft Update Catalog or other release channels. We recommend that you update your devices to the latest version of Windows.

 

11/17/20

For information about Windows update terminology, see the article about the types of Windows updates and the monthly quality update types. For an overview of Windows 10, version 22H2, see its update history page. 

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

Highlights

  • This update addresses security issues for your Windows operating system. 

Improvements 

Note To view the list of addressed issues, click or tap the OS name to expand the collapsible section.

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

This security update includes quality improvements. Key changes include: 

  • This build includes all the improvements from the supported Windows 10, version 21H2 editions.

  • No additional issues are documented for this release. 

Important: Use EKB KB5003791 to update to Windows 10, version 21H2 on supported editions.

This security update includes quality improvements that were a part of update KB5034203 (released January 23, 2024). When you install this KB:

  • This update addresses an issue that affects explorer.exe. It might stop responding. This occurs when you restart or shut down a PC that has a controller accessory attached to it.

  • This update addresses an issue that affects the download of device metadata. Downloads from the Windows Metadata and Internet Services (WMIS) over HTTPS are now more secure.

  • This update addresses an issue that affects the Certificate Authority snap-in. You cannot select the "Delta CRL" option. This stops you from using the GUI to publish Delta CRLs.

  • This update addresses a known issue that might send you error 0xd0000034. This occurs when you try to upgrade some eligible devices to Windows 11 from Windows Update.

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 February 2024 Security Updates. 

Windows 10 servicing stack update - 19044.3989 and 19045.3989

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.

Symptom

Workaround

Windows devices using more than one (1) monitor might experience issues with desktop icons moving unexpectedly between monitors or other icon alignment issues when attempting to use Copilot in Windows (in preview).

We are gradually rolling out a new Copilot experience for devices with KB5039299or later updates installed. This new experience will address this issue.

KB5039299 was released on June 25, 2024, and you can expect to receive the new Copilot experience sometime from now until the next few months.

Copilot in Windows (in preview) is not currently supported when your taskbar is located vertically on the right or left of your screen.

We are gradually rolling out a new Copilot experience for devices with KB5039299 or later updates installed. This new experience will address this issue.

KB5039299 was released on June 25, 2024, and you can expect to receive the new Copilot experience sometime from now until the next few months.

After you install KB5034203 (dated 01/23/2024) or later updates, some Windows devices that use the DHCP Option 235 to discover Microsoft Connected Cache (MCC) nodes in their network might be unable to use those nodes. Instead, these Windows devices will download updates and apps from the public internet. IT administrators also see increased download traffic on their internet routes.

Those of you who use the Home edition of Windows are not likely to experience this issue. MCC and DHCP Option 235 are typically used in enterprise environments.

This issue is addressed in KB5040525.

How to get this update

EXPIRATION NOTICE

IMPORTANT As of March 31, 2026, this update is no longer available from the Microsoft Update Catalog or other release channels. We recommend that you update your devices to the latest version of Windows.

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