The headings of unread messages are displayed in bold text in your Inbox. The number of unread messages can be seen next to the Inbox folder in the Navigation Pane. You can find your unread messages in the Unread Mail folder under Search Folders in the Navigation Pane, where the unread messages are arranged by folder.
In the Navigation Pane, click the plus sign (+) next to Search Folders to display its subfolders.
Click the Unread Mail folder.
Your unread items are displayed in the message list.
Tip: To make the Unread Mail folder more visible, drag it to the Favorite Folders pane.
Important: When you delete a Search Folder, the e-mail messages shown in the Search Folder are not deleted because those items are never saved, only viewed, in a Search Folder. However, if you open or select one or more e-mail messages shown in a Search Folder and delete the e-mail messages, the messages are deleted from the Microsoft Outlook folder where they are stored.
The Unread Mail folder is one of the predefined Search Folders. If you don't see this folder under Search Folders in the Navigation Pane, you can re-create it.