When preferred senders are enabled, you can view your Inbox as tabbed or sorted. The sorted view displays messages from preferred senders at the top of your message list. The tabbed view displays your message list as three tabs. The first tab displays all of your messages, the second tab displays only messages from preferred senders, and the third tab displays only messages from senders not designated as preferred. You also have the option of enabling icons for your preferred senders to display in the From field in your message list.
Repeat these steps for other contacts that you want to designate as Preferred Senders.