"Not surprisingly, questions that probed deeper found VMware's
domination to be far from permanent:
* Microsoft's Hyper-V is used by more 25 percent of
respondents.
* VMware shops are hardly monogamous. On average, in VMware
environments, two hosts or hypervisors are in use.
* About half of VMware users are planning to increase their VMware
usage, the other half may look to other solutions in the
future."