Deploying clustered Hyper-V servers in Windows 2008 R2 involves a wide variety of technologies, including Hyper-V, Failover Clusters, Cluster Shared Volumes, Live Migration, Microsoft System Center Virtual Machine Manager, Windows PowerShell, iSCSI and FC storage, dynamic and fixed VHDs, pass-through disks, networking, and more. Janssen Jones, a Microsoft Virtual Machine MVP, has spent the last two years immersed in complex Hyper-V deployments, and has gathered a wealth of information to share, both from personal deployments, and from the forums. Come learn about best practices, frequently asked questions, tips, and tricks around virtualization, clustering, scripted and automated deployments, disaster recovery, and more! Bring your Hyper-V and clustering questions, and prepare to take your HA Hyper-V deployments to the next level.
You may also want to look here: http://windows7forums.com/virtualization/48872-exchange-server-2010-sp1-vhd.html