Is there a How-To Guide for how the Thunderbird Address Book works? A while back I converted from Eudora to Thunderbird and I now have a complicated list of Address Books on the left-hand side of my Address Book screen. Some seem to be duplicates of others: The primary listing of the Books shows a blue box to the left of the name. Most of the names are ones I named myself, but a couple of them are a five digit number that I have no idea where they came from. One of those five digit books (64687) has an "arrow" pointing to the right which when clicked on, opens a sub-folder with another list of Address Books with a "two-body" icon on the left. The "two-body" sub-books seem to be duplicates of some the blue-box books. If so, I'd like to consolidate and minimize the number of books on my lists, but I don't want to make any mistakes and delete something I shouldn't. So that's what I'm trying to do... any help would be greatly appreciated! Thank You!!!