I recommend the /other/ pine2mutt instead
I tried this, and in it's attempt to do everything related to switching me over, it did too much. It also failed to import many of my pine addressbook entries. This page, which offers another "pine2mutt" perl script, was much more helpful for me:
The Debian distribution of mutt includes a "Pine.rc" file, which provided a lot of the familiar Pine key bindings, among other things.
This software didn't end being very useful in my transition.
An open, cross-platform journaling program.
A scientific plotting package.