When I bulk migrated my Eudora address file from Eudora to Thunderbird, several named sub-files containing groups of email addresses were not imported into Thunderbird. How can I select (copy?) one of those named Eudora group files that wasn't 'bulk' migrated, and then import that group file into one of the three address books in Thunderbird that I ended up with? Those three address books are titled: "Personal Address Book", "Eudora Nicknames", and "Collected Addresses".

Another related question: How do I move a named group of address from one if these address books to another?