Windows Server 2008 (codenamed Windows Server Longhorn/Windows Longhorn Server) is one of Microsoft Windows' server line of operating systems. Released on February 27, 2008, it is the successor to Windows Server 2003. Windows Server 2008 is the server counterpart to Windows Vista, and was codenamed Windows Server Longhorn.
Like Windows Vista and Windows 7, Windows Server 2008 is built on Windows NT 6.x.
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