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Quick note: the recommended for all Hyper-V configurations vs. recommended if you meet the scenario documented in the KB.

• Recommended updates for all configurations: Required column = Yes
• Recommended update if you meet the scenario: Required column = Yes, ONLY install if the issue applies to you.

Comprehensive list of Hyper-V updates : Applies To: Windows Server 2008

http://technet.microsoft.com/en-us/library/dd430893(WS.10).aspx

Comprehensive list of Hyper-VR2 updates : Applies To: Windows Server 2008R2

http://social.technet.microsoft.com/wiki/contents/articles/1349.hyper-v-update-list-for-windows-server-2008-r2.aspx

List of Hyper-V Packages Updated After the Release of Windows Server 2008 R2 Service Pack 1 (SP1) :

http://social.technet.microsoft.com/wiki/contents/articles/3150.list-of-hyper-v-packages-updated-after-the-release-of-windows-server-2008-r2-service-pack-1-sp1.aspx

NOTE: For Windows Server 2008 R2 Hyper-V systems with SP1 installed, there are two recommended updates for all configurations:

• KB2263829 – Hyper-V networking issue that multiple customers hit; This fix is also published on WU.
• KB2525835 – Security Update