February 24, 2026—KB5077239 (OS Build 28000.1643) Preview

February 24, 2026—KB5077239 OS Build 28000.1643 Preview ​​​​​This non-security update for Windows 11, version 26H1 KB5077239, includes the latest security fixes and improvements, along with non-security updates from last month’s optional preview release. To learn more about differences between...