Windows 11 build 21660

{Infobox Windows build }}
 * build of = Windows 11
 * buildtag = 10.0.21660.co_refresh

Windows 11 build 21660 is an unconfirmed build of Windows 11. It was mentioned in an image shown in a post on Windows Central. [https://thewincentral.com/windows-11-summer21-co_release-fall21-co_refresh-developments-explained-in-a-collated-timeline