Migrating from Linux to Snow Leopard - how to migrate mboxes

We are moving from a Linux (Fedora) environment to a mac running Snow Leopard server and will need to migrate a couple of our imaped mailboxes - inbox, sent mail, and some folder for a couple of account holders.
We have a mail server that has a problem. We want to replace the entire server (which serves the mail now to everyone) with the new mac server. Same name, same ip address, same everything.
What is the best way for us to do this to ensure that we don't loose any data - and we have a lot (years of company critical messages) of it. This is critical for at least 2 of our key people who must have audit trails of incoming and sent emails for contractual reasons.
Is there some way we can migrate the existing mailboxes over to the new mac server? This is a fedora core linux setup with standard sendmail running with dovecot for imap - if that helps.
Thanks in advance - we are under a major time crunch.

If you mean on a per user bases, then the answer is probably yes... here is an example from http://pwet.fr/man/linux/commandes/imapsync :
To synchronize the imap account buddy on host imap.src.fr to the imap account max on host imap.dest.fr (the passwords are located in too files /etc/secret1 for buddy, /etc/secret2 for max) :
imapsync --host1 imap.src.fr --user1 buddy --passfile1 /etc/secret1 \
--host2 imap.dest.fr --user2 max --passfile2 /etc/secret2
Then, you will have buddy's mailbox updated from max's mailbox.

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