I got an SBS 2011 server in a Hyper-V environment, but I'm not sure if creating 2 or 3 VHDs will couse a performace issue.
First VHD will contain the OS
Second the Company Files
Thrid will be the Exchange Mail store
I'm worried if I put the mail store in with the company files it could let to greater fragmentation with in the VHDs.
(naturally the user will not able to access the exchange mail store folder directly)
Also 3 VHD will be on the same RAID 5 array on the vhost.