Microsoft is a leader, right behind VMware on the June 2012 Magic Quadrant for x86 Server Virtualization released by Gartner.
But wait – in this magic quadrant, Gartner compares Windows Server 2008 R2 Hyper-V and System Center 2007 with VMware vSphere 5. You can imagine what would be the outcome if they were to consider Windows Server 2012 Hyper-V and System Center 2012!!
What is also interesting to note, is about the cautions that Gartner have mentioned about Microsoft vs. VMware:
For Microsoft, the cautions are all around sales & marketing, such as penetrating VMware installed base and facing competition. For VMware, however, the caution is about customer concerns around vendor lock-in – specifically around the lack of support for heterogeneous environments, a strength in System Center 2012 that brings flexibility to customers.