What is the road map for windows 7 server?Is it a upgrade of win2008? if then, why release win2008 r2?

Actually... This is not really the right forum for discussing Windows Server 2008 R2. This forum might be the best place to ask your question.BUT... I will offer up thisminireviewby ZDNet's Jason Perlow who happens to think it's the greatest thing since sliced bread. And he's NOT easy to impress when it comes to Microsoft products. He really hated Windows 7 as a client, but thinks the world of R2.