I found this list on a blog from Micosoft with recommended hotfixes, update and more for Window Server 2012 R2. Hyper-V: Update List for Windows Server 2012 R2 Also the KB from Microsoft points out some recommeded hotfixes and update for Windows Server 2012 and Windows Server 2012 R2 Hyper-V Network Virtualization (HNV) environments. Recommended hotfixes, updates, and known solutions for Windows Server 2012 and Windows Server 2012 R2 Hyper-V Network Virtualization (HNV) environments