This option controls which address book you see when you open the Address Book (via clicking Ctrl+Shift+B) and when you click the To, Cc, or Bcc buttons when composing e-mails.read more...
If you want to construct a more complicated distribution list, with some recipients on the To field, some recipients on the CC field, and yet more recipients on the BCC field, you have to use a message template where you explicitly assign recipients to each field.read more...
In some situation you may want to send your vCard in every message. This lets recipients enter the information in their address book quickly and without errors.read more...