I'm using "imapsync" from
http://www.linux-france.org/prj/ successfully.
Quote:
The command imapsync is a tool allowing incremental and recursive imap transfer from one mailbox to another.
We sometimes need to transfer mailboxes from one imap server to another. This is called migration.
imapsync is the adequate tool because it reduces the amount of data transfered by not transfering a given message if it is already on both sides. Same headers, same message size and the transfert is done only once. All flags are preserved, unread will stay unread, read will stay read, deleted will stay deleted. You can stop the transfert at any time and restart it later, imapsync is adapted to a bad connection.
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Read
http://www.linux-france.org/prj/imapsync/README first.
- Gert