Is out and that one should be installed. Fixes a lot of stuff.

http://support.microsoft.com/default.aspx/kb/961983

Issue 1

When you migrate VMware virtual machines, the resource pools that are associated with the virtual machines are changed.

Issue 2

Hyper-V virtual machines have a status of "unsupported cluster configuration" if a node in a Windows Server 2008 Failover Cluster does not respond or has been restarted.

Issue 3

Differencing disks are lost when the following conditions are true:

• You migrate a virtual machine from a Virtual Server host.
• Multiple virtual machines share the same parent virtual hard disk file.

Issue 4

The agent status is not updated for Windows Server 2008 Failover Cluster nodes.

Issue 5

Hyper-V virtual machines in a Windows Server 2008 Failover Cluster have a status of "unsupported cluster configuration" if the cluster has a resource that has an MSCluster_Property_Resource_Cluster_Extension_XP_Type type. This resource type is typically used by storage replication software.

Issue 6

If you add a Virtual Center server by using an account that is a member of the Enterprise Admins group, you receive the following error message when the refresh host job runs:

This hotfix rollup also includes the fixes that are documented in the following Virtual Machine Manager 2008 update: