PublicFolders using Maildir and INDEXPVT in Dovecot v2.2.13

[Panayiotis Fafakos]

Dear all,

we have succesfully configured Dovecot v2.2.13 in debian wheezy 7.8 
(using backports)
using Maildir structure, to use private index files for the \Seen flag 
on a per user basis.

All users access their emails and Public Folders using IMAP protocol.

The problem is that when a user moves an email from publicFolderA to 
publicFolderB under the same namespace
the other users see this message as unread, although they have actually 
read it when it was in publicFolderA.

Please note that this is an old message which has been moved , it was 
not copied, so the actual UID should be the same...

Is there a way to keep the \Seen flag for the messages that are moved 
from folder to folder?

Is there a way to keep the \Seen flag in a database, so that we can 
ignore the folder structure and only check the message UIDs? We could 
use MySQL, PgSQL or even SQLite...

Below follows the Public-Folder namespace declaration:
------------------------------------------
namespace {
   inbox = no
   location = 
maildir:/var/vmail/Public-Folders:LAYOUT=fs:INDEXPVT=~/Maildir/public/%u
   prefix = Public-Folders/
   separator = /
   subscriptions = no
   type = public
}
------------------------------------------

With the above system configuration we have the complete folder 
structure under ~/Maildir/public/%u, and many log files, one for each 
folder a user has accessed.
Could we only have one index file for each user for all the public 
folder structure under the same namespace?

Kind regards to all,
Panayiotis Fafakos