Important: When you delete a Search Folder, the email 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 email messages shown in a Search Folder and delete the email 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.
Outlook shows the message “we didn’t find anything to show here.” when looking in a folder that shows unread items. Cause The views in outlook can become unresponsive causing it to not display the emails.