Great news from the Exchange team today. They have announced enhancements to the virtualization support of Microsoft Exchange Server 2010 running with SP1.
With Exchange SP1 the following scenarios are now supported running under hardware virtualization:
A new Best Practices for Virtualizing Exchange Server 2010 with Windows Server 2008 R2 Hyper-V whitepaper has also been released.
Read more about these enhancements on the Exchange Team blog.