When Luisa got an iBook, I was the guy to handle the data move from the PC Thunderbird over to the tightly-integrated Mail application in Mac OS X.
The article Export Outlook @ MozillaZine Knowledge Base, I edited it.
The docs were an illegible mess, but I got through them. I like wikis, and I was glad I’d found *some* hints on what to do.
When I was half-way through the instructions, I started to edit them.
**Update**: It seems that the more recent Thunderbird 0.8 sports some snazzier export functions (for instance to Outlook and Outlook Express). Maybe the aforementioned problem is gone by now. Good.