I have zimbra up and running nicely.

My next task is to import old mail into the database. It will be coming from two sources. Our old server died several months ago, and it was running postfix using maildirs (one file per message). That mail archive was backed up into a .tar file and I have it on disk. Since the server switch, we have been running a hosted server running Exim. Both sources need to be transferred. I have read the past messages here about imapsync and other ways of migrating "live" archives, but what about the "dead" ones on disk? Any suggestions?