vpopmail+qmail+maildir

[Jussi Salokangas]

I have about 200 users on system. Everyone has a file called 'Mailbox' and
I would like to change 'Maildir' so I could use qmail pop-3.
Is this possible with some script, that root could change them to Maildir?
I don't want to: su user , /var/qmail/bin/makemaildir, so I am just
asking, is there easier way?:)