Microsoft Hyper-V "Quick Migration" not good enough for datacenters:

Learn more details of Quick Migration weakness compared to all other hardware-based hypervisor vendors Vmotion and Live motion abilities. Also learn more on how VMotion actually works.
Read more: part 1 and part 2.

As the Article states:
"Every other hardware-level virtualization provider in the market, with the exception of Microsoft, is enabling their customers to enjoy the freedom of no downtime migrations. It begs the question: Where is Microsoft’s Quick Migration really good enough? As a follow-up: Why would you want to go that route when every other hardware based virtualization provider can offer you no downtime migrations."