There are numerous keyboard shortcuts you can use in Outlook to navigate through the interface and read your email in double-quick time.
The space bar is one of my favourites. Make sure your reading pane is visible then try it by clicking on an email in your Inbox then pressing the space bar. If the email is longer than your reading pane can display each press of the space bar scrolls through the email for you. If you want to go backwards press SHIFT+space. And when you've finished reading one email, another click of the space bar brings up the next email in your Inbox. Pretty quick, eh?!
Another favourite of mine comes into play when you have opened an email in its own window. Once you've finished reading the email try pressing CTRL+>. As if by magic the next email in your active folder appears in the same window! Need to put yourself in reverse? Just press CTRL+<.
Or of course, Microsoft thinks you can also "dance" to read your email.