Now, back to the question. You can find a current list of updates for Hyper-V here:
Hyper-V Update List for Windows Server 2008 R2
Updated: September 15, 2010
Applies To: Windows Server 2008 R2
This list isn’t very long so give it a look and make sure your Hyper-V hosts are up to date.
Until next time,
Great resource, thank you