In Outlook 2007 and Outlook 2010, you can use Alt+F1 to toggle the Navigation pane and Alt+F2 to toggle the To-do bar. The panes roll between Minimized, Off, and Normaleach time you press the key combination.
In Outlook 2013, Alt+F1 will roll through the Navigation pane layout: Off, Minimized, and Normal. Outlook 2013 does not have a To-do bar and the shortcuts do not work for the peeks.
Ctrl+F1 will minimize or open the ribbon in Outlook 2010 and 2013.
Published March 19, 2008. Last updated on March 28, 2013.