[Dovecot] merge mdboxes

[Tobias Daucher]

Hi there,
after migration we have a very big problem...
there are two mailboxes in /var/mail/username/mailboxes/
/var/mail/username/mailboxes/inbox
/var/mail/username/mailboxes/inbox2
i DO have to merge these boxes, but i found no tools for this step. is  
there any way with doveadm oder dsync to move alle messages from mdbox  
inbox2 into mdbox inbox?
i hope you all can tell me a way to do this - its a very very big  
problem at the moment.
By the way - logging in via imap with thunderbird und move them on  
that way is not my favorite solution cause i have to do this for  
hundreds of users...
i hope you can help me! thanks a lot!
Tobias Daucher