Q. Deleted the Unread folder.
Solution.The Unread Mail folder is one of Outlook's default Search Folders (Search Folders: Virtual folders that contain views of all e-mail items matching specific search criteria. The items remain stored in one or more Outlook folders.). If deleted, you can create it again.
In Mail, on the File menu, point to New, and then click Search Folder.
Tip You can also open the New Search Folder dialog box by pressing CTRL+SHIFT+P.
In the Reading Mail section, click Unread Mail.
Click OK.