things have come a long way since this article was written -- maybe due to developers getting excited over Jaguar, I don't know. if you look around on versiontracker and other download sites, you'll see an increasing number of solid-looking conversion programs that don't require you to get your hands dirty.
outlook2mac is the one i settled on. it grabs email, attachments, calendar, and contacts from outlook and puts them an a format you can DRAG into most programs like entourage, apple mail, ical, address book, or whatever program i'm using, and the fields dont get messed up. (the only key is the program you use has to support the major transport standards like vcard, ical, or mbox, but otherwise, it's works solid).