You can change the default list in which the Outlook client references contact names.
For example, if there is a John Smith in the Global Address List (on the server) and a Carrie Smith in your Contacts, by default, if you enter Smith in the To: field of an email message, Outlook will automatically add John Smith (from the Global Address List). You can toggle this option so that Outlook will automatically add Carrie Smith (from your Contacts).
To change the default contact list,
- open the Outlook client.
- Click on Address Book in the Find pane.
- In the Address Book, click Tools > Options.
- Adjust your settings accordingly.
- Click Apply.
- Click OK.
- You may then close the Address Book.