[Dovecot] Courier-to-Dovecot-migration: Outlook downloads all Mails again

[Werner]

Hi everybody,

I'm currently playing through the migration from Courier to dovecot. I've converted
the User's Maildir with 'courier-dovecot-migrate.pl'. Outlook 2003 is configured
to access the Mailbox via POP3, the option "Leave a copy of messages on the server"
is activated.

But: after the migration Outlook 2000 redownloads all mails again :-(

Could it be, that Outlook 2000 "thinks" (after changing the POP3/SMTP-Server in
the Outlook configuration pointing to my testsystem) this is a new system and starts to
download the messages again?

If so, Outlook 2000 won't download all messages again if we do the migration because
POP3/SMTP-Server remains the same. Can anybody confirm this?

We do not experience this issue with Thunderbird for example.

Thank you,
Werner