1. On the toolbar, in the farthest group on the right labeled "Find", click on "Address Book"
2. In that address list, select "Tools" and then click on "Options"
3. In the drop down menu underneath where it says "When opening this address book, show this address list first:", select "Global Address List" or whichever option you would like the new default to be. This will change the default to what you need instead of the Offline Global Address List