Just read this interesting post on Networkworld, regarding ABM’s transition from VMware to Hyper-V.
ABM have around 60 Hosts running their Virtual enviroment. They have been running VMware for 3 years, and decided to migrate their workload over to Hyper-V. The article discusses their decision making process and how they decided to approach the project. All in all it makes for quite an interesting read.
The full article is available here: http://www.networkworld.com/article/2358254/virtualization/abm-overcomes-pro-vmware-bias-to-adopt-microsoft-s-hyper-v.html