View: Reading Pane
The Reading Pane displays your E-mail messages. You can choose where you would like to see the Reading Pane: Right, Bottom or Off (hidden.)

4. Try it: Change the Reading Pane
Go to View ->Reading Pane.
Select Bottom.

What Do You See? The E-mail message will be displayed on the bottom.

Try This, Too: Change it Back
Go to View ->Reading Pane.
Select Right..

Keep going...

Outlook->Inbox->View