I am planning for a transition of Exchange 2003 on a physical box to Exchange 2010 on vSphere. I have about 35 mailboxes and will not have more than that for a while. What is a recommended approach as far as role installs are concerned? I have two Dell hosts configured with dual quads and 32GB of RAM and a MD3000i iscsi SAN. Should I perform a typical install and place all roles on one VM(Windows Server 2008 r2) with 4 vCPUs and 8GB of RAM or split the roles onto two VMs? Also, should I create a separate data store on the SAN with RAID 10 for best performance or will RAID 5 suffice? Anyone have a setup like this for small business? Any advice is appreciated!