How to export from Thunderbird to... Thunderbird?

[Angrist]

I'm trying to import my mail stuff (mails, settings) from my previous PC, but I can't find the option. I'm using Thunderbird and I will use it again.
Does anyone know how to do that? Maybe it's just a matter of copying some files, but I couldn't find any yet.

[Bond]

http://support.detto.com/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=12&nav=0

[Angrist]

Yay, thanks a bundle! :)