The most basic task you’ll probably want to accomplish with Outlook 2013—and right away, no doubt—is checking and responding to your email. Outlook makes it very easy for you to read your messages quickly and respond to them in kind.
Click the Inbox folder.
Click a message header.
Preview the message in the Reading pane.
Either at the top of the Reading pane or on the ribbon, on the Home tab, click Reply.
Type your reply.
Click Send to send the message.
If you prefer ...