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:
Note: August 10, 2016: You might notice that the folder pane in Outlook has disappeared. The Outlook team is aware of this issue and actively investigating to release a fix. In the meantime, please go to View > Folder Pane > Normal, to turn the folder pane on. We will keep you posted on updates.
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.