http://blogs.technet.com/aralves/archive/2008/08/11/hotfix-for-windows-failover-clustering-and-hyper-v.aspxIf you are running Windows Failover Clustering and Hyper-V then this patch might apply to your environment. With this hotfix we increase functionality and add more control to Hyper-V virtual machines running in a clustered environment. Here are some ofenCommunityServer 2.1 SP1 (Build: 61025.2)