This is a step by step article.
This article describes the steps to restore the unread mail folder or any other folder that has been deleted from the Favorites section of Outlook 2010.
Open Microsoft Outlook and click with the right button of the mouse on the Search folders folder on the menu on the left. Then, click on New search folder.
Select Unread mail (selected by default) in the New search folder window and click on OK.
The Unread mail folder appears in Search folders. Click on it using the right button of the mouse and select Show in Favorites.
The Unread mail folder will now appear in the Favorites section of Outlook 2010.
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