[Dovecot] IMP, Dovecot and multiple namespaces

[Rick Romero]

Hey guys,

I'm wondering what the best way is to be backwards compatible with  
Courier mailbox formats and not duplicate mailbox trees with Dovecot.   
Is anyone doing this right now?

My Dovecot 2.0.13 is configured as follows for Namespaces:

namespace {
   inbox = yes
   location =
   prefix =
   separator = .
}
namespace {
   hidden = yes
   inbox = no
   list = no
   location =
   prefix = INBOX.
   separator = .
}

So I should have an INBOX, plus additional root folders - rather than  
the Courier default of all folders being subfolders of the INBOX.

So when I run LIST in IMAP I get -
08 LIST "" %
* LIST (\HasChildren) "." "INBOX"
* LIST (\HasChildren) "." "Spam"
* LIST (\HasNoChildren) "." "Sent"
* LIST (\HasNoChildren) "." "Trash"
* LIST (\HasNoChildren) "." "Junk"
* LIST (\HasNoChildren) "." "Drafts"

Which looks fine.

The problem is, IMP (old and new) show two sets of mailboxes (one for  
each namespace) like so:

INBOX
Spam
Spam.Over10
Sent
INBOX.Spam
INBOX.Spam.Over10
INBOX.Sent
(etc)

I assume IMP is walking the INBOX because it says it has Children, and  
displaying those Children - The Horde team is telling me that's the  
root of the problem.  It makes sense, but I'm not sure what the real  
solution is.

Is it possible to disable Children for a mailbox when an alternate  
hidden namespace matches the mailbox name?  Does that make sense?
Or, is there another option I change change in the dovecot config to  
accomplish the same?

Rick