moving from mbox to maildir.

[Eric Lalonde]

my users currently get email in mbox format in /var/spool/mail, and i want
to switch to /Maildir/ format. i know there are three subdirectories under
the user's Maildir, but where do i copy currently unchecked email in
/var/spool/mail, so that this mail will be listed under Maildir as
'unchecked' email?
thanks

eric