If you’re using multiple address books, for example, one for personal use and another for just a hobby-related group, you can change the order in which Outlook checks these address books. This way, when you start writing the name of a contact to the address field of an email, Outlook suggests the most relevant contacts first.

  1. On the Home tab, in the Find group, click Address Book.

  2. Click Tools > Options, and select Custom.

  3. Click the up Up arrow and down Down arrow arrows next to the list to move your address books.

    You can define the order Outlook accesses your address books by using the arrows.

  4. Click OK.