[Dovecot] popa3d migration

[FiL @ Kpoxa]

Hello,

 I'm sure there is no good answer to my question, but it doesn't take 
much to ask, so I will.

 I am about to migrate my current Dovecot IMAP + Popa3d mailbox server 
to Maildir.
I need to keep both protocols (IMAP and POP3) and will be switching to 
Dovecot on both.

The question is simple - is there any way to keep POP3 UIDs through 
migration, so people won't get duplicates
in their inboxes.

Second question is not that important but if somebody has a good answer 
it will be really nice - is there any way
to keep IMAP UIDs? With IMAP it won't create dups, but loosing 
(changing) UIDs will create extra load on the server.

I know, this is more about mailbox->Maildir conversion, not dovecot, but 
this is the only place I can ask this question

P.S. am running dovecot on linux FC5 right now, but will be upgrading to 
FC6 / dovecot 1.0 release at the time of migration.
Won't do it before 1.0 final comes out

Thank you,

FiL