To set your MX-Contact Contacts folder as an Outlook Address Book, do the following:

1. Select the Contacts folder and right click, selecting Properties:
   
   
   
   
2. Click the Outlook Address Book tab:
   
   
   
   
3. Check the box labelled Show this folder as an e-mail address book and give it a name, e.g. MX-Contacts. Click OK.
   
   
4. When you send a mail, click on the To... button:
   
   
   
   
   
5. Select MX-Contacts from the Show Names from the: drop down:
   
   
   
   
6. Locate the contact you want and click To-> button (or CC or Bcc). Then click OK.