Importing emails from Maildir

[Dalton]

Thanks to everybody who answers my questions. You are VERY helpful.

Before installing kolab, I had Postfix and courier-imap in my server, and 
incoming email where stored in the correspondent /home/user/Maildir.

I still have those Maildir, with different folders in each one, and the 
tipical cur/new/tmp folders inside, and my question is, how can I import all 
those mails into my new kolab accounts?