How to enable folder List view in Outlook 2010
The so-called Folder List view allows you to see your complete MS Outlook folder structure (including Mail, Calendar, Contacts, Tasks, Journal and Notes folders) in the Navigation Pane.
To enable the Folder List view in MS Outlook 2010, click the Folder List button (Fig. 1.) at the bottom of the Navigation Pane.
Alternatively, with MS Outlook 2010 open press CTRL+6 on your keyboard for the same effect.
To see subfolders located under parent folders, expand a parent folder by clicking the small white arrow to the left of the folder name (Fig. 2.).