[ubuntu-za] Upgrade to Ubuntu 9.04 Modufied configuration

[Dr. Johan P. Prinsloo]

Hi, I need help again. This particular PC wants to make my life
difficult. I've been able to upgrade from 8.10 to 9.04, and now during
the upgrade it comes up with this :

debconf on pcjp3 (the name of this PC)
Modified Configuration File
What would you like to do about dovecot.conf

If I click on help it says; A new version of configuration file
etc/dovecot/dovecot.conf is available, but the version installed
currently has been locally modified.
 there are 5 options;
1) install the package maintainer's version
2) keep the local version currently installed
3) show the differences between the versions
4) show a side-by-side difference between the versions
5) start a new shell to examine the situation

What am I to do with this?