Outlook is more than just an email program. You can also manage your calendar, contacts, tasks, or notes. The navigation bar is how you switch between the different views.
Click the view you want to see.
The Navigation Bar replaces the buttons that appeared at the bottom of the Navigation Pane in Outlook 2003, Outlook 2007, and Outlook 2010.
When you start Outlook, the Mail view appears. The Navigation Bar displays four views—Mail, Calendar, People, and Tasks. To see other views—Notes, Folders, and Shortcuts—click .
For more information on how to customize the Navigation Bar, see Change what appears on the Navigation Bar.