Multi-server consolidation

[Gary W. Smith]

I have a couple different servers that have several mailboxes on them
and I would like to migrate them to a single new server.  The new server
will handle all of these mailboxes just fine.  All of the mailboxes are
unique across all of the servers.

I have copied the /var/[spool/lib]/imap to the new server from one box
and everything seems to be working fine there.  Now it's the issue of
getting the rest of the mailboxes over to the new machine.  There are 4
machines in total with about 2000 email accounts.  

I'd prefer not to use any type of imap copy as we want to preserve the
flags and we don't have the luxury of changing the user passwords.

Any suggestions?

Gary