Procedures for Outlook:
- Click "Start" -> "Settings" -> "Control Panel".
- Double Click "Mail" .
- Click "E-mail Accounts" button.
- Choose "View or change existing directories or address books" from the Directory group. Then click the "Next" button.
- Choose "Personal Address Book"
- Click the "Remove" button
- Click "Yes" when prompt for confirmation
- Then click "Finish"
Note: If you need to add back the service you can refer to "My Personal Address Book is not available anymore, what should I do?".