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.
Note
For Outlook for Mac, please go to View only your unread messages in Outlook for Mac.
View only unread messages in new Outlook
Select the folder you want to filter for unread messages.
Near the upper corner of the message list, select
Filter > Unread.
Tip
The name of the filter button changes to Unread to indicate which filter is applied. When you want to remove the filter so that you can see all the messages in the current folder, simply click the
Unread filter button.