[Dovecot] migration from IMAP/POP3 courier server to a remote dovecot server

[nik600]

Dear all

i'm planning a transparent migration from a courier server that provides
both IMAP and POP3 access to users to a remote dovecot server with both
IMAP and POP3 access.

I have to migrate about 2500 users for 250 GB of space.

I'm using dovecot 2.2.5.4 on debian6 squeeze.

To make a transparent migration i have to maintain old IMAP UIDs and POP3
UIDs, so i've read

http://wiki2.dovecot.org/Migration
and
http://wiki2.dovecot.org/Migration/Courier
and
http://wiki2.dovecot.org/Migration/Dsync

And decided that probably the best tool to use is Dsync, as the
courier-dovecot-migrate.pl<http://www.dovecot.org/tools/courier-dovecot-migrate.pl>
script
works only locally.

I've tested the dsync following instructions reported above but after the
migration of one test-account the client re-download messages.


If i want to keep both  IMAP UIDs and POP3 UIDs i have to sync both imapc
and pop3c with two commands?

doveadm -o imapc_user=foo -o pop3c_user=foo -o imapc_password=bar -o
pop3c_password=bar backup -R -u user at domain imapc:

doveadm -o imapc_user=foo -o pop3c_user=foo -o imapc_password=bar -o
pop3c_password=bar backup -R -u user at domain pop3c:

Or imapc is enough?

Do you have any suggestion?

Thanks

-- 
/*************/
nik600
http://www.kumbe.it