fetchmail and courier-imap

Hi,

I'm using fetchmail to retrieve mail from a remote mail server on my server
:
for each user, I get a file : /var/spool/mail/$user

and I've just installed courier-imap on my server, but when I create a
mailbox for a user, it's always the folder /home/user/Maildir
How can I do to have the same mail folder/file for courier-imap and
fetchmail ?

thanks for your help,
Akut