Windows 11 build 21990

Windows 11 build 21990 is the earliest build of Windows 9 that is known to have screenshots. A screenshot of this build was posted on the "Inside Windows" Telegram by Zac Bowden, showing the search bar with "Windows Security" highlighted as an option. This build features a "Do not take screenshots of this build" watermark.

It was also referenced along with build 22117 in a video on the Windows Insider Program's official YouTube channel 25 seconds into the footage.

The minimum required version for Desktop App Installer is also 21990.0.