The configuration for Dovecot 2.x has changed. The master configuration file /etc/dovecot.conf
has moved to /etc/dovecot/dovecot.conf
and other parts of Dovecot configuration have moved to /etc/dovecot/conf.d/*.conf
. The majority of the configuration is the same and is compatible with this new version; however, you can test your configuration and list which options have been renamed, removed, or otherwise changed in this new version with the following command:
doveconf [-n] -c /old/dovecot.conf