Live Migration is the Microsoft Hyper-v feature where you move a running virtual machine from one physical host to another physical host while the VM continues to run.  Check out more from Brian below….

http://mythoughtsonit.com/2013/03/step-by-step-high-availability-live-migration-part-12-of-20/

Get the whole series at Dan Stolts’s post (0 of 20) at:
http://itproguru.com/expert/2013/03/become-a-virtualization-expert-with-20-days-of-server-virtualization-virtexpert-itproguru-part-0-of-20/

To download the 180-Day Windows Server 2012 evaluation bits go to:  http://aka.ms/msproducts