On the University of Iowa Campus, the Global Address Book, or GAL, is displayed as the default Address Book in Outlook.
To change this in Outlook 2016:
- From the main Outlook 'Home' window, select Address Book
- In the Address Book window, select Tools | Options...
- In the Addressing window, update the When opening the address book, show this address list first drop-down to the preferred list.
- Click OK