Microsoft is also using R2 as the launching pad for new licensing for virtualization software that took effect Dec. Windows Server R2, which ships in x64 and x86 versions, is built on Windows Server SP1 and is the first R2 release of the server operating system since Microsoft initiated a release cycle in May that called for a major operating system upgrade every four years, with a lesser "R2" release in between. And go to the next level with our Insider Pro website.
Two days later, the beta was released to the public via the Microsoft Download Center. The remaining languages were available around August IT professionals with TechNet subscriptions were able to download Windows Server R2 and obtain product keys for English, French, German, Italian, and Spanish variants beginning August 14 and all remaining languages beginning August
Windows Server 2003 R2 Install Tutorial