Microsoft Windows 11 24H2 Update Version OS Builds 26200.9445 and 26100.9445

KB5124008 updates Windows 11 24H2 with security improvements, Secure Boot certificate deployment, and fixes for mouse, personalization, Teams/Outlook on Arm64, Remote Desktop audio redirection, and OMA-DM logging. It includes OS Builds 26200.9445 and 26100.9445. Reference IDs: KB5120998, KB5124007.

• Provides security improvements.
• Expands Secure Boot certificate coverage for eligible devices and continues certificate deployment via Windows updates.

• Fixes customized mouse cursor settings, including pointer style and color, not displaying correctly.
• Fixes desktop background and other personalization settings not loading correctly, which could cause a black desktop background.
• Fixes Microsoft Teams and Microsoft Outlook unexpectedly closing on Arm64-based PCs.
• Fixes Remote Desktop audio redirection issues that could prevent remote audio from playing locally in some configurations.
• Improves OMA-DM client diagnostic logging for troubleshooting device management server connection issues.

• If previous updates are already installed, only the new updates in this package will be downloaded and installed.
• Includes servicing stack update KB5124007 (Build 26100.9441) to improve Windows Update installation reliability.
• Windows 11, version 24H2 Home and Pro editions reach end of updates on October 13, 2026; Enterprise and Education remain supported until October 12, 2027.

Product Information

Vendor: Microsoft

Product: Windows 11

Product type: Software

Application category: Utilities

Platform: Windows

Variant: 24H2

Version: OS Builds 26200.9445 and 26100.9445

Vendor information published: Sep 8, 2026

Original release notes: View on vendor site

Published on updatealert.io: Sep 9, 2026

Description: Client operating system for modern desktop and enterprise environments.