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Windows Server 2012 R2 removed support for processors without CMPXCHG16b, PrefetchW, LAHF and SAHF.Ī further update, formally designated Windows Server 2012 R2 Update, was released in April 2014. It is the successor to Windows Server 2012, and is based on the Windows 8.1 codebase. It was unveiled on June 3, 2013, at TechEd North America, and released on October 18 of the same year. Windows Server 2012 R2, codenamed "Windows Server Blue", is the seventh version of the Windows Server operating system by Microsoft, as part of the Windows NT family of operating systems. Paid support via the Extended Security Updates program until October 13, 2026, only for volume licensed editions.
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Mainstream support ended on October 9, 2018.