I’m trying to migrate mdbox to maildir based on https://wiki.dovecot.org/Migration/MailFormat

• Modified dovecot.conf and set mail_location=maildir:/tmp/destination/mailboxes/
• Then I had run

/mnt/testmail/bin/dsync -Dv -u user@domain.com mirror mdbox:/source/mailboxes/user@domain.com

but that did nothing. Then I have

• Modified dovecot.conf and set mail_location=mdbox:/source/mailboxes
• Then I had run

/mnt/testmail/bin/dsync -Dv -u user@domain.com mirror mdbox:/tmp/destination/mailboxes/user@domain.com

that copied over user@domain.com mailbox from the source to the destination location. As that was working I have tried to run

/mnt/testmail/bin/dsync -Dv -u user@domain.com mirror maildir:/tmp/destination/mailboxes/user@domain.com

but that got an error:

dsync(user@domain.com): Debug: Namespace inbox: type=private, prefix=, sep=, inbox=yes, hidden=no, list=yes, subscriptions=yes location=maildir:/mnt/testmail/mailboxes

dsync(user@domain.com): Error: User initialization failed: Namespace '': Unknown mail storage driver maildir

First problem is that based on example #2 from above provided syntax in https://wiki.dovecot.org/Migration/MailFormat is incorrect or for some reason is not working for me as it should for example #1.

Second issue is not recognizing maildir format – what about that? Docecot has some missing libraries?

Thanks,

Adam