While IDC is basically saying that Microsoft will rule the hypervisor segment during 2009, an interesting bit of information emerge from a SearchServerVirtualization.com article.
Covering the competition between VMware and Citrix on hypervisors fault tolerance, the author also mentions Microsoft and reports a quote from Zane Adam, Senior Director of Virtualization Product Management and Marketing, that said:
We don’t see this [fault-tolerance software for Hyper-V] as an area of high demand right now, but we are watching this closely.
This may mean that Microsoft has no plan to implement any form of fault tolerance for Hyper-V 2.0, expected somewhere in 2010.