Windows 10 build 9900

Windows 10 build 9900 is a build of Windows 10, which was uploaded to BetaArchive on 29 January 2015.

It is the earliest available build of Windows 10 to be compiled in the  branch.

Taskbar

 * The taskbar design has been changed to a flatter style and now uses the black color seen in the RTM.
 * Taskbar search has been improved with the addition of a text box.
 * Security and Maintenance icon on the taskbar has been removed.

Cortana

 * Cortana has been added.

Windowed Metro

 * The window design has changed to a more modern style.

PC Settings and the Control Panel

 * PC Settings has an updated homepage.
 * Update Center has been removed from Control Panel.

Charms Bar

 * Charms bar received a minor update.
 * Settings section has been removed from it.

VMWare Workstation
This build cannot be installed on VMWare Workstation since an virtual CPU error will occur right when the OS starts up.

UEFI BIOS
This build can only be installed on machines utilizing UEFI firmware since it hangs on a BIOS system.

Window thumbnail color error
Window thumbnails on the taskbar do not change color, but the user can change it after the computer restarts.