http://blogs.msdn.com/b/architecture/archive/2009/12/15/ars-technica-windows-server-2008-r2-more-a-brand-new-os-than-an-r2.aspxWindows Server 2008 R2 may sound a lot like its predecessor, but in many substantial ways it's a brand new product, despite the simple "R2" tacked on the end. Ars takes a detailed look at all the new stuff that's hidden under that "R2"en-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)