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.

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 is also the first build to introduce the final "Windows Server 2012" branding, replacing "Windows Server 8 Beta".