So, as long as we’re on the subject of losing your email… You may want to check out BackityMac. It allows one-click backups of your Mail.app and Entourage emails… along with iCal Calendars, Address Book entries, and a whole bunch of other stuff.
I just tried it out and it works great. It creates a standard disk image (.dmg) of the backups, so it’s not some funky proprietary format, that you can’t access later on without the software that originally created it. You can just mount the image and drag the stuff out. Although BackityMac does offer a Restore function to save you the trouble.
BackityMac is donationware, so technically it’s free to use, but if you like it, you should consider making a donation. It’s the right thing to do.