Windows 10 build 18290 (rs prerelease)

Windows 10 version 1903 build 18290 was released on 2018-11-28 to Insiders in the Fast Ring.

New features

 * The timebomb has been extended to 2019-07-05
 * Icons have been added to the shutdown portion of the Start Menu
 * An option to manually synchronize your clock with the time server has been added
 * You can see which app uses your microphone now by hovering over the microphone notification icon
 * Cortana and Search landing page has been updated
 * Windows Update will now display an orange indicator in the notification area when a reboot is required
 * Other general changes, improvements, and fixes

Other Updates for Insiders

 * Mail & Calendar Version 11001.20106 has been announced alongside this build.