Windows 10 build 9860

Windows 10 build 9860 is the second officially released Technical Preview build of Windows 10. Its buildtag was initially found through the ThresholdInternal build update mechanism on 10 October 2014. It was later released to those who joined the Windows Insider Program on 21 October 2014 and was downloadable via the Preview Builds build update mechanism in build 9841.

New features and changes

 * Action Center, a Windows Phone-like notification area, was returned compared to 9841.
 * Support for the Matroska Multimedia Container and the HEVC codec has been introduced.
 * Metro apps can now run in screen resolutions lower than 1024x768.
 * Window animations have been updated.

Window thumbnail border color error
If window auto-colorization is enabled, the window thumbnail borders on the taskbar do not change color even after the wallpaper changes. This issue can be remedied by manually changing the window color through the Control Panel or restarting Windows.