and is based on the Windows 8.1 codebase. It is the final version of Windows Server to use the "R2" suffix, which had been used since the release of Windows Server 2003 R2.

It removed support for processors without CMPXCHG16b, PrefetchW, LAHF and SAHF. A further update, formally designated Windows Server 2012 R2 Update, was released in April 2014. It is a cumulative set of security, critical and other updates. Windows Server 2012 R2, like previous versions