Never mind. I found this link, which describes the files used by Pegasus in detail:
Looks like more work than it's worth.
firstname.lastname@example.org (Don Hyams) wrote in message news:<email@example.com>...
> I'm running Pegaus Mail 4.12a on a Windows 98SE PC. I've been using
> and upgrading Pegasus Mail through about 6 versions now.
> Soon I'll be getting a new PC running XP-Pro. I'd like to do a
> "clean" install of 4.12a and import ONLY my settings (Options,
> Internet Options, Mail filtering rules, etc.) and my messages/folders
> from my old PC. I've noticed files like W32-301B.LOG that I don't
> think are needed anymore. In other words, I'd like to leave all the
> unused remnants of previous versions behind.
> I guess my big questions are:
> * Which non-program files (ie, configuration & mail) are used by the
> current version of Pegasus?
> * Are there enough remnants to make it worth the trouble to "clean