Windows Server 2008 R2
A second release, Windows Server 2008 R2, was released on October 22, 2009. Retail availability began September 14, 2009. Windows Server 2008 R2 reached the RTM milestone on July 22, 2009. Like Windows 7, it is built on Windows NT 6.1. New features include new virtualization features, new Active Directory features, IIS 7.5, and support for 256 logical processors. Support for 32-bit-only processors (IA-32) has been removed. On July 22, 2009, Microsoft officially announced that they had released both Windows Server 2008 R2 and Windows 7 to manufacturing. Windows Server 2008 R2 was generally available for download from MSDN and Technet on August 19 and for retail purchase from October 22, 2009.
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