How to set Automatic Replies in Outlook (new)

This article explains how to set your Out of Office reply if you are using Microsoft Outlook (new).
How to set Automatic Replies in Outlook (Desktop)

This article explains how to set your Out of Office reply in the desktop version of Microsoft Outlook.
How to set Automatic Replies on a Shared Mailbox

This article explains how to set an automatic reply for a Shared Mailbox.