Have you tried with another client as we suggested?
Have you tried creating a subfolder whithin that directory you created?
Maybe Outlook needs a special way of configuring the folders ("/" instead of "."). Check http://wiki.dovecot.org/MailLocation/Maildir
I have tried with another client, but its the same result.
i cant create a folder because all mail is stored in 1 file... not in folders.
i think the problem is because of that.
But im rather a newbie so i dont know that much of how it works...