Last weekend I upgraded my Home Lab and changed from ESXi5.1 to Hyper-V 2012.
Hardware
AMD A8 3870K 3.00GHz 4MB FM1 Box
Asus F1A75-V PRO AMD A75, SATA600 RAID, HDMI (ESXi5.1 Works to with extra E1000 nic)
32GB 8×4 Kingston HyperX
Converted al my VM’s with StarWind V2V Converter
It Rocks!!! 
The last piece required to support coexistence and start migrating from Exchange 2010 to Exchange 2013, just got delayed some days…
“We found an issue with Exchange 2010 coexistence. The issue actually had an easy workaround, but we made a decision; instead of burdening you with a configuration change on all of your Exchange 2010 Client Access servers, we decided to take a code change in Exchange 2013 and solve the problem so that you will not have to make any additional configuration changes. Given that the goal of CU1 is to enable coexistence with legacy versions of Exchange, we felt this was the right decision; after all, we want to ensure that your upgrade to Exchange 2013 and your coexistence period goes as smooth as possible.”
“The release date for Exchange 2013 RTM CU1 is currently planned for April 2nd”