Build list legend
|Version of Microsoft Windows
2026-10-13 (with Extended Security Updates)
|Windows Server 2012
|Windows Server 2016
Windows Server 2012 R2 is the server counterpart of Windows 8.1. It reached RTM on 27 August 2013 and was released on 18 October of that year. It replaces Windows Server 2012 and was replaced by Windows Server 2016.
This is the first version of Windows Server to drop support for processors without the CMPXCHG16b, PrefetchW and LAHF/SAHF instructions. It is the last version to support upgrade paths to Windows Server 2016 and also the last version to support upgrade paths from Windows Server 2008 R2.
There are four editions of this operating system: Essentials, Foundation, Standard and Datacenter. As with Windows Server 2012, the Datacenter and Standard editions are feature identical, varying only based on licensing (particularly licensing of Hyper-V VMs). The Essentials edition has the same features as the Datacenter and Standard products, with some restrictions.
Windows Server 2012 R2 is officially compatible with all Xeons released from 2006 to 2017 and all AMD Opterons with the instructions the OS requires. Later processors (1st gen Xeon Scalable and AMD EPYC) are not supported due to Windows Update being blocked on newer processors. There are patches that allow Windows Update to work on these processors.