Mutt used to move mbox to maildir format?

[hanasaki]

I have several hundred megs of email in Netscape mbox format and need to
move them to maildir format to be used by imap server.

Is there a way to use Mutt to attach to these mbox's and the imap server
at the sametime and then copy the email / folders into imap?  The imap
server, courier, will take care of formatting the maildir directories if
it is interfaced through imap protocol.

Alternatively, is there another, possibly better, way to accomplish my
goal?

Thank you