If you have multiple email addresses associated with your Outlook account you may have multiple contacts lists as well. One of those contact lists is the default, but another list appears when you click the To button on a new email or when you click to view the contacts. You can get to the desired contact list, but have to click around to get it. How can the desired contacts list be made the default?
In Outlook 2010, select Contacts form the navigation pane at the top of the screen. Make sure the Home tab is selected. Click the Address Book from the options on the ribbon, (far right side). Now click the Tools menu button and then select Options. Pick Start with contact folders. Pick the desired address book from the drop down list. Click Ok.
In Outlook 2003/2007 you would click on the Tools menu option. Select Address Book. Now click on Tools and then Options. From the When Sending mail… drop down list select Contacts or All Contacts.