How to change the default Address Book
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.
To change the default Address Book, do the following:
1. Select Tools -> Address Book (or click Ctrl+Shift+B) to open the Address Book... dialog box:
2. In the Address Book dialog box, choose Tools -> Options... to display the Addressing dialog box:
3. From the drop-down list labeled Show this address list first, select the desired address book.
4. Click the OK button and close the Address Book dialog box.