Just a follow up for anyone in the future with the same problem we had who searches this list for a solution:
Obviously we were foolish not to be backing up the registry. Anyone using imail should be backing up the registry every night because it's crazy important.
That being said, we got very lucky yesterday. The automatic registry backups performed by imail saved us from disaster. If anyone ever has the same situation we had (your registry is corrupted or destroyed in some way, you have a backup or unharmed copy of the imail directory, you don't have a backup of the registry) try this:
1. Do a fresh install of imail (make sure this install does not over-write your backed up copy of the imail directory).
2. Shut down all imail services.
3. take out the newly-installed imail
directory and replace it with your backed-up copy of the imail directory
5. Open the imail administrator. Click "localhost". Click "Backup".
6. Hopefully you will see some imail backup files. Select the most recent one and click "restore".
7. This should restore your registry to the state it was in when that backup file was created. Re-start all your imail services and everything should be working again.
8. Now that everything is (hopefully) fixed, go set up a scheduled task to back up the imail registry using either regback.exe or regedit every night.
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