Windows Server R2

Windows Server R2 (codenamed Whistler R2/Whistler Server R2/Server Whistler R2/Bobcat R2) can either refer to an individual or following versions of Microsoft Windows:
 * Windows Server 20xx R2 (codenamed Whistler R2/Whistler Server R2/Server Whistler R2/Bobcat R2) (2005 - present)