When creating a new email in Outlook, you can either enter someone's
email address directly into the To box or you can click on the To -> button and search for people's email addresses in the Global Address List or Your Contacts.
When you click on the To -> button, by default, Outlook will automatically show you the Global Address List as shown below.
You can change this option so that by default Your Contacts are shown instead of the Global Address List.
To do this, while in your Inbox select to Tools | Address Book.
This will open the Address Book window as shown below
Go to Tools | Options
This opens the Addressing window as shown below
Select Contacts from the Show this address list first: drop down menu as shown below
Click on Apply. Click on OK.
Close the Address Book window.
From now on when accessing the address book in a new email you
should automatically be taken to Your Contacts and not the Global