Windows 10 build 21303
| Build of Cobalt | |
| OS family | Windows 10 (NT 10.0) |
|---|---|
| Version number | 10.0 |
| Build number | 21303 |
| Build revision | 1000 |
| Compiled on | 2021-01-26 |
Windows 10 build 21303 is a build of Cobalt, the 21H2 development semester of Windows as a service. It was mentioned in an issue posted to GitHub repository of Sandboxie on 29 April 2021.[1]