I am trying to migrate a number of user mail accounts from dovecot 1.0.7 on a centos 5.11 server to dovecot 2.1.7 on a debian 7 server
Foolishly I thought I could simply replicate the Maildirs from one server to the other using rsync, change the dns and all would be fine.
Sadly that did not work.
While the process did seem to go well Thunderbird on my test account is insisting on re downloading ALL the mail as duplicate unread emails.
Is there a way I can import the mail from the source centos server to the destination debian server without forcing the user to potentially having to sort through and delete hundreds of duplicate emails?
I am using IMAP for the mail protocol