Installed Win 7. I saved outlook exp, to external HD. I'm having a problem transferring address book to Thunderbird. Tried importing address BK , failed.

Before installing win 7, I copied outlook express address book to external drive. I tried to import the address book to TB but that didn't work. I cut and pasted the address book to notepad. It's listed as a cvs file. I tried hitting the start button and opening the contact folder but I don't get the option to select export, I also tried cut and past from notepad but don't get the option to select paste in the TB add.