I followed the instructions here and they worked very well.  However, I had already set up a user in Thunderbird (it was the same email address and user that was imported).

I tried editing the profiles.ini file to point to the new folder but that did not work for some reason.  Thunderbird thought that there was another instance running and would not open at all.  I ended up just changing the name of the folder that I had brought over from Windows to the one that was already established and it worked great.

 After checking the server settings (these did not all come across, or it may have been due to my circumstances of a previous installation) I am sending and receiving mail!

Cheers -

Chris