[Dovecot] Best way to migrate versions and machines

We are looking to migrate from our current mail server running dovecot-1.2.11-3 to a new mail server running the latest dovecot (2.0.9?). So this would not only be a version change but also a machine change. We currently use Maildir for storing mail and would like to stay that way.

Has anyone preformed such a feat and it worked? Looking for any input.