This product is 5 STARS. We needed to move from a hosted product to an in-house solution alomost two years ago and afterlooking at many solutions we decided to take the CANIT plunge. The experience has been terrific and we use this for both managed service clients as well as for a hosted Exchange environment.
The flexibility and scalability are both great and this runs in a virtual environement with no issues.

The Vendor also makes referrals based upon your location which has also been a plus for us.