Windows 10 build 21254
| Build of Cobalt | |
 | |
| OS family | Windows 10 (NT 10.0) |
|---|---|
| Version number | 10.0 |
| Build number | 21254 |
| Build lab | rs_xbox |
| Compiled on | 2020-11-04 |
| SKUs | |
| Enterprise | |
Windows 10 build 21254 is a build of Cobalt, the 21H2 development semester of Windows as a service. A screenshot of this build was shown by a Microsoft employee on C# Discord server on 11 November 2020.[1]