Folders provide a way to organize email messages, calendars, contacts, and tasks in Outlook. To add a folder to the folder pane, do the following:
In the left pane of Mail, Contacts, Tasks, or Calendar, right-click where you want to add the folder, and then click New Folder.
Note: When in Calendar, the New Folder command is replaced with New Calendar.
In the Name box, enter a name for the folder, and press Enter.