[Dovecot] importing outlook express messages to dovecot imap server

Hi,

I have a local Dovecot 1.1.4 running. I have a big number of outlook express messages that I like to put into Maildir so that I can use Dovecot's imap to access. I can convert them into mbox format. any available means for me to import outlook express/mbox messages into Maildir/Dovecot? command line will be preferred, Thanks,

Angelo