Thunderbird is a free email application that can be used to manage your email account. It also has a built-in address book that stores the contact information of all your email contacts. If you ever need to backup your Thunderbird address book, you can do so by exporting the address book to a file.
To export your Thunderbird address book, first open Thunderbird and click on the “Tools” menu. Then, select “Address Book”.
In the Address Book window, click on …
