Moving mail to a new server

In my case, it is somewhat simple because I have only one account. But, in general, how do you move mail from one server to another? I have tons of messages still in the imap server that somehow need to get other to the new server.
The other sticking point is I have only one license. So I can't run both imap servers at the same time. In fact, I pretty much have to shutdown the current server just to work on the new server.
Thanks

hi - i just did this - found a script called imapsync (http://www.linux-france.org/prj/imapsync/). you can run it using this bash script:
#!/bin/bash
USER=$1
PASSWORD=$2
1MAILSERVER="";
2MAILSERVER="";
/usr/bin/imapsync "Junk|Deleted\ Messages" --host1 $1MAILSERVER mail server> --user1 $USER --password1 $PASSWORD --host2 $2MAILSERVER --user2 $USER --password2 $PASSWORD --syncinternaldates

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