[Dovecot] Subfolder in Maildir

[Bart Braem]

Hello,

We have installed a brand new Dovecot because it seems very interesting as
an IMAP server. We created a mailbox for a test user and we succeeded in
copying some mails into it. 
However making subfolders does not work. The only folders we can create are
in the root, next to the INBOX that is. We thought Maildir does support
subfolders (as opposed to mbox), are we wrong here?
Our Dovecot version is 1.0.b8_1. 

Bart