Windows 10 build 21279 (rsmaster)
| Build of Cobalt | |
 | |
| OS family | Windows 10 (NT 10.0) |
|---|---|
| Version number | 10.0 |
| Build number | 21279 |
| Build lab | rsmaster |
| Compiled on | 2020-12-09 |
| SKUs | |
| Enterprise | |
Windows 10 build 21279 (rsmaster) is a build of Cobalt, the 21H2 development semester of Windows as a service. A screenshot of this build was posted to GitHub by a Microsoft employee on 15 December 2020.[1]