How to change the default Address Book in Outlook

If a user needs to change the default Outlook Address Book, there are a few simple steps to achieve that.

In Outlook 2010:

Go to the Find group on the Home tab, select Address Book;
In the Address Book window choose Tools menu, then Options...;
Under "When opening the address book, show this address list first:" select the Address Book of your choice;
Save the changes by clicking OK.

In Outlook 2007 and 2003:

In the Tools menu, select Address Book...;
In the new window choose Tools menu, select Options...;
Under "Show this address list first:" select the Address Book of your choice;
To save changes, click Apply.