When you first install OutLook 2010 you may have noticed it doesn't have the default "unread" email search folder. No need to worry, you can create your own by following these steps:
In Mail, click on the Folder tab, then click the New Search Folder in the New group (or use the keyboard shortcut CTRL+SHIFT+P).
- Double click on Unread Mail in the Reading Mail section.
- Drag the Unread Mail folder to the Favorites section (optional).