I'm planning a migration of my courrier-imap server to Zimbra soon.
One thing I want to do before, is to be able to rollback to my old server in case of emergency.
So, the idea would be to backup all mailboxes from Zimbra, one time a day, and so we could restore any mailbox when we want.
The problem is that the Zimbra store doesn't seems to use Maildir structure : There is no cur/new/tmp directories, and emails are saved as .eml files.
We don't want to use splitdomain. We tried using offlineimap / imapsync, but theses solutions doesn't seems very good either, poor performances, and the big problem is that if a mail is moved or deleted after the last sync, it won't be the case when running a new sync. (at least with imapsync).
So for us, the best solution appear to make a tgz of each mailboxes (We have 200 acounts), and we could restore it if our Zimbra server fail.
To conclude, I'm just looking for a way to convert a backup tgz to maildir format
Thanks for any suggestions