There people, Within Thunderbird it is not possible anymore on a computer of a friend of mine to show all the different Address Books. Ctrl+Shift+B only shows only the "Personal Address Book" and no other "Collected Addresses" books or customized address books. When he sends an new e-mail then it is possible to choose from all the present address books. So he did not delete the other address books. The screen shot i attached is in Dutch. Kind regards Nic Wilms