I caught this post up on my colleague's blog on Hyper-V and support for Exchange. http://blogs.technet.com/jkruse/archive/2008/06/27/hyper-v-is-here-what-about-exchange.aspx
For those hosters who are considering delivering a Hyper-V based solution for virtualised Exchange solutions please see the following detail:
In case you haven't heard the news, we have released Hyper-V into the wild. In fact did you know that 25% of microsoft.com is already running on Hyper-V VMs?
So what about Exchange Server?
As we recently announced at Tech.Ed USA, Microsoft will be publishing a support statement with respect to Exchange Server on Hyper-V within 60 days of today.
Some of the more noteworthy bits of info from the session are:
In terms of best practices and requirements, the following guidance was released:
Let's not forget however that the recommended method to build a hosted Exchange platform is to use the HMC 4.5 guidance found here: www.microsoft.com/hosting