Turn the Reading Pane on or off
You can preview items in your Inbox without opening them by using the Reading Pane — just click the message to display the text of the item. In the Reading Pane, you can also open attachments, follow a hyperlink, use voting buttons, view the follow-up information in the InfoBar, and respond to meeting requests.
What do you want to do?
Turn on the Reading Pane
On the View menu, point to Reading Pane, and then click Right or Bottom.
Turn off the Reading Pane
On the View menu, point to Reading Pane, and then click Off.