Let me start by saying I'm in unfamiliar territory right now. I'm the Webmaster at a college and suggested we move to Zimbra for email. We had a test environment up and running and were pretty pleased when our home grown email server went down. I'm now being requested to turn our test environment into a live environment. Not only is it a little out of my area, but it's certainly not the most ideal way to roll this into production.
All that aside, we have no documentation on the current email server. All I know is that it stores the messages in /var/spool/mail I'm hoping that there is a way we can import all emails from this system to our new Zimbra install, but I'm really not even sure where to get started. Can someone help get me in the right direction?