Thunderbird Win to Evolution Ubuntu?

[The Wassermans]

I have Thunderbird (ver 2.0.0.14 for Windows) on an old PC.  I want to
transfer all of that mail to Evolution (Ubuntu 8.04) on my present PC.

There is no apparent export function in T/Bird.  (The Internet has some
suggestions but I can't get any of them to work!)

Where and what directories/files can I copy to the new PC in order to
have Evolution import the mail?

(If need be, I could tolerate importing them in T/Bird Ubuntu as they
are generally reference mails anyway.)

Dave W