kb5099539

Additional coverage of this story: KB5099539 Fixes Windows 10 COM and OneDrive Bugs, Hardens RDP Neowin highlights expanded Secure Boot certificate targeting and dynamic readiness reporting, and specifies LTSC 2021 support dates: January 2027 for Enterprise and January 2032 for IoT Enterprise...

Additional coverage of this story: KB5099539 Fixes Windows 10 COM Failures, Adds RDP SHA-2 Trust Neowin’s coverage adds LTSC 2021 support end dates—January 2027 for Enterprise and January 2032 for IoT—and recommends piloting VPNs, endpoint agents, management tools, and custom networking stacks...

Windows 10 KB5099539 is now rolling out for eligible Extended Security Updates and LTSC installations, moving Windows 10 22H2 to build 19045.7548 and Windows 10 21H2 to build 19044.7548. Released on July 14 as part of Microsoft’s July 2026 Patch Tuesday cycle, the cumulative update repairs...