[BlueOnyx:20654] IMAP subfolders

[Gregg K]

I have a client who has been trying to do subfolders in IMAP.  I searched
around and found some old questions regarding this subject, but has anything
been done about this more recent? Is there an easier way to accomplish this
on BlueOnyx and dovecot?
I think from what I read you have to configure dovecot to use something
other than mbox.  Is that easily accomplished on BlueOnyx without breaking a
whole bunch of other things?
Thanks,
Gregg