[imp] 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.

I would like IMP users to only see the non 'hidden' namespace, but I'm  
not sure how to accomplish that without completely turning it off.    
Any ideas?

Rick