Windows 10 build 21387 (co_release)
| Build of Cobalt | |
 | |
| Architecture | x86, x64, ARM64 |
|---|---|
| Compiled | 2021-05-18 |
| Timebomb | 2021-10-31 (+166 days) |
| About | |
Home China Home N Home Single Language Pro Pro N Pro Single Language Pro China Only Pro Education Pro Education N Pro for Workstations Pro N for Workstations Education Education N Enterprise Enterprise Evaluation Enterprise G Enterprise G N Enterprise multi-session Enterprise N Enterprise N Evaluation IoT Enterprise Team Cloud Cloud N | |
  | |
Windows 10 build 21387 (co_release) is the nineteenth Insider Preview build of Cobalt, the 21H2 development semester of Windows as a service. This build was released on 21 May 2021 to all Windows Insiders on the Dev Channel.
Changes[edit | edit source]
- Internet Explorer 11's functionality has been disabled and attempting to run its executable file (
iexplore.exe) will open Edge instead. It is still possible to run Internet Explorer ifieframe.dllis replaced with a copy from an older build. - The "Eco mode" experimental Task Manager feature introduced in build 21364 has been removed.
- The first log-in has been updated to use smaller and Segoe UI Variable text, though the flashing animation is still kept.
Bugs[edit | edit source]
News and interests[edit | edit source]
- The flyout might occasionally flash in the screen's top left corner when opened.
Camera Settings[edit | edit source]
- The Camera app does not respect the brightness adjustments made to a camera under its respective page.
Installation[edit | edit source]
- The update process to this build has a chance of hanging for extended periods of time.
- Some devices might fail to upgrade to this build with error code
0xc1900101due to a second issue different from that in build 21382.
OOBE[edit | edit source]
- The OOBE may use an incorrect font when this build is ran under Simplified Chinese language pack.
General[edit | edit source]
- Certain parts of Search, including the File Explorer search box, are not displaying correctly in the dark theme.
- The icons for Microsoft Edge and File Explorer in the taskbar are swapped in clean installations.
Gallery[edit | edit source]
Boot screen
