We currently have Hyper-V 2008 R2 with KB2744129 installed. I am looking to build a Windows Server 2012 R2 VM within the next couple of weeks, which is months ahead of our planned upgrade to Hyper-V 2012. Microsoft's document about Hyper-V supported client operating systems mentions that Windows 8 & Server 2012 client VMs are supported if you have KB2744129 installed. However, there is no explicit mention of Windows 8.1 or Windows Server 2012 R2. Additionally, the editions column for Server 2012 only lists Enterprise and Datacenter editions as being supported. Considering that this document was updated 11/18/2013, does this mean that only non-R2 Enterprise & Datacenter versions of 2012 will work and/or be supported?