To delete contacts from the address book:
1.On the Address Book tab, on the Address Book Pane, select an address book. The contacts in this address book appear in the Contact List.
2.Select one or more contacts in the list.
3.Press Del or from the context menu of any of these contacts, select Delete and confirm the action.
The selected contacts will be deleted from your address book.
You can also delete an added contact when viewing a message.