When viewing the email in the message pane, a tab or new window there will be a star to the right of the senders address. If the star is filled with color it is already in one of your address books. If the star is open you can click on it to add it to the book. Clicking a filled star will open the contact edit window so you can add details or move it to another address book. '''This is NOT the same star to the left of the message header in the Inbox window.'''