Windows 10 build 21387 (co_release_fun)
| Build of Cobalt | |
| OS family | Windows 11 (NT 10.0) |
|---|---|
| Version number | 10.0 |
| Build number | 21387 |
| Build lab | co_release_fun |
| Compiled on | 2021-05-18 |
Windows 10 build 21387 (co_release_fun) is a build of Cobalt, the 21H2 development semester of Windows as a service. Several issues related to this build were posted to GitHub by a Microsoft employee on 20 May 2021.[1][2]