cannot see folders list on Dovecot IMAP server

This new CentOS server (Postfix 2.10 and Dovecot 2.2) has a handful of users who are connecting using IMAP. None of them can see any of the folders, neither "Inbox", "Sent", nor any of the other ones. Sending e-mail works fine, arrives at recipient's mailbox, but doesn't show in sender's mail client.
What am I missing?
zolcerManaging DirectorAsked:
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zolcerManaging DirectorAuthor Commented:

Postfix delivers all e-mail to /var/mail by default.
Dovecot uses Maildir.
Tell Postfix to also use Maildir by adding  "home_mailbox = Maildir/"  to and all is fine ...

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nociSoftware EngineerCommented:
Alternative: use dovecot as mda.  (then the MTA delivers mail i one stream to the MDA and the MDA dispatches it to the right mailboxes.
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