The left side of the Outlook 2013 window is the Folder Pane (Folder Pane: The column on the left side of the Outlook window that contains folders for each view, such as Mail or Calendar. Click a folder to show the items in the folder. Formerly the Navigation Pane in earlier releases.). Like folders in a file cabinet, it’s how you organize email messages, contacts, tasks, and other Outlook items.
When you click a folder, you see the items it contains. For example, click Inbox to see your new messages. Messages in a folder show in the message list (message list: The list of messages within a mail folder. Information appears about each message such as the sender, date, subject, and whether attachments are included.).
If the folder contains subfolders, click . That expands the folder list so you can see the additional folders. To collapse the folder view so you don’t see subfolders, click .
The contents of the Folder Pane change based on what you’re doing. For example, when you’re working with your Calendar, the Date Navigator (Date Navigator: The small calendar that displays the current month in Calendar. It provides a quick and easy way to move appointments and to view other dates.) appears at the top of the Folder Pane. When you’re reading mail messages, the Favorites section—a set of mail folders you frequently want to use—is in the Folder Pane in addition to your mail folders.
In Outlook 2003, Outlook 2007, and Outlook 2010, the Folder Pane was called the Navigation Pane.