Windows 10 21H2 build 19044.4651 (KB5040427) — release notes, downloads, known issues

Windows 10 · 21H2 · Release · Security update (Patch Tuesday)

Feature update to Windows 10, version 21H2 (19044.4651)

Windows 10 21H2: Servicing ended

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Coverage Important Reminder: Windows 11 Versions 21H2 and 22H2 Lose Support on October 8, 2024 Aug 8, 2024 · Windows 10 21H2 coverage from this build's release window
Coverage End of Support for Windows 11 Versions 21H2 and 22H2: Essential Update Guide Aug 9, 2024 · Windows 10 21H2 coverage from this build's release window
Coverage Critical Update: Windows 11 21H2 and 22H2 Support Ends October 8, 2024 Aug 10, 2024 · Windows 10 21H2 coverage from this build's release window
Fix Windows 11 Patch Tuesday Updates: Enhance Security for Versions 23H2, 22H2, and 21H2 Aug 13, 2024 · Windows 10 21H2 coverage from this build's release window

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Builds sharing the .4651 minor, released within three days.