A good reminder - Outlook keyboard shortcuts
I spend a lot of time in Outlook at work. I need to force myself to start using these keyboard shortcuts. I might map one of my mouse buttons to Ctrl-4 for tasks. Note they don't work in earlier versions of Outlook.
Update: This switches the Navigation pane to the default view that was introduced in Outlook XP. I dislike that view and had swapped it out. Somewhat annoying!