Windows Server 2012 build 8400

Windows Server 2012 build 8400 is the official Release Candidate build of Windows Server 2012, which was released on 31 May 2012 along with the client counterpart.

Changes

 * This is the first build of Windows Server to drop support for processors without PAE, SSE2 and NX, as running on these processors will display a black screen with error code 0x5D.
 * This build introduces the "Windows Server 2012" branding, replacing "Windows Server 8 Beta".
 * The boot screen no longer uses a betta fish graphic.
 * Setup now resembles that of the RTM.
 * The default accent color has been changed.
 * The lock screen now uses a solid gray background.
 * Administrative Tools are now pinned to the Start screen by default.
 * The desktop background has been updated to the one used in the RTM.
 * Icons which reference the old Windows logo (ex: Windows Update) have been changed.

File Explorer

 * The Ribbon has been updated with a flatter appearance.
 * Window coloring no longer extends to the navigation bar when the Ribbon UI isn't being utilized.
 * Navigation bar icons have been updated.