Hi
I am using it in a windows environment, and SME environment...
I have found it easy to configure and use once you have done a it a few times, and the customer love being able to recover mail easily, especially in the Insurance industry where they are required to keep copies of all mail
Great product and should work on your configuration, 50 mail boxes is not alot, I have it working on a SME server with 900 users with SMTP / POP from 6 different countries around the world., and that machine is busy, about 90GB of mail a month ( Dual Core 2.6 with 2GB RAM and 250GB HDD, the archiving is done to external drives.)
Cheers