The Inbox or any other mail folder can be filtered to display only unread messages. By default, unread messages appear in bold in the message list.
To display only the Outlook messages that have not yet been read, take these steps.
-
While in the Outlook app, open the View menu.
-
Go to Filter By and select Unread in the submenu.
Your action will be confirmed with a checkmark by Unread in the menu.
Note: You can also toggle the Unread filter on or off with the shift-command-O key combination.