I'm wondering now is it even possible to use the same mbox's from 0.99.13-3 with version 1.0.15-2? Why move from the great-great-granddaddy version to the granddaddy version?
Do yourself a favor and install the latest stable (currently 2.0.4)...
All modern distros have repositories you can install it from. There has been chatter on the FreeBSD forum regarding introducing the new 2.x release into the ports system. Personally, I have advised against it unless the port is clearly marked as "USE AT OWN RISK". Timo appears to be introducing patches for the 2.x version on a nearly daily basis. Until this version stabilizes and can go at least a few weeks without something major breaking, I would recommend against using it on a production server. Obviously, what you use on your home machine is your own business.
All true, but there is a current 1.2.14 out there which should probably be preferred ove a two-and-a-half year old 1.0.15. Jakob