Windows 11 Version 21h2 Build 22000.978 | 22h2 ... May 2026

All editions of Version 21H2 reached the end of servicing by October 8, 2024, meaning they no longer receive security or quality updates. Transition to Windows 11 Version 22H2 (Build 22621)

Released as part of "Patch Tuesday," Build 22000.978 (KB5017328) focused on stabilizing the operating system and addressing security vulnerabilities. Windows 11 Version 21H2 Build 22000.978 | 22H2 ...

Windows 11 Build was a major cumulative update for the original version of Windows 11 (21H2), released on September 13, 2022. It served as the final primary maintenance update before Microsoft launched the first major annual feature update, Version 22H2 , on September 20, 2022. Windows 11 Version 21H2 (Build 22000.978) All editions of Version 21H2 reached the end