transferring users to new server

[Petre Agenbag]

HI
I have an existing server running an older version of cyrus-imap and
cyrus-sasl. I have quite a number of users on the system, and would like
to find out what the procedures are for migrating them to a new server
running cyrus-imap-2.2 and sasl2.
IE. I need to copy the mailboxes and contents thereof as well as the
usernames/passwords, and I need to know specifically which files/folders
to move, and what is needed (if anything) to be done on the new server.

thanks