Thanks for the reply. I'm afraid I'm repeating myself.
When I started out with TB 1.0.7 a few days ago, after using Netscape (my last version was 6.2 and it included the browser, mail client and html editor), I imported my entire mail profile stored on the hard drive from Netscape. The address books in that profile were not only Personal Address Book and Collected Addresses, but 5 other separate address books, and in the beginning the list of all 7 appeared in the sidebar on the left when I clicked on Address Book Management, so that I could choose whichever I had to work on when adding, deleting or changing address book information. I know these address books are somewhere because when I write a message, and the Contacts sidebar appears, they appear in the drop down line, and I can choose from among them.
But the entire sidebar in Address Book management has disappeared and that is what seems to be the real problem -- that and the fact that the list of addresses in the Address Book Management main pane window doesn't correspond to any one of my original address books, and not to the Personal or the Collected Addresses either. Whatever happened, the question is how do I go back to where I started from. I keep looking at the window, thinking there may be a secret button, arrow, link, something which will allow me to restore the Address Book Management window to what it originally was.
No luck. And I'm no programmer, just an end user.
Helpless and wondering whether to change software.
UserAgent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.5) Gecko/20050729 Netscape/8.0.3.3