http://blogs.technet.com/tonyso/archive/2009/01/09/windows-server-2008-r2-hyper-v-beta-bits-are-live.aspxGo to http://www.microsoft.com/Windowsserver2008/en/us/R2-Beta.aspx for the bits, reviewer's guide, relnotes and other info. What’s in it for virtualization? 1. Live migration of Virtual machines 2. Hardware enhancements: Nested Page Tables (NPT) anden-USCommunityServer 2.1 SP1 (Build: 61025.2)