Out of Office Reply (OWA)
- Navigate to OWA at https://outlook.office365.com/ 
 - Enter your credentials to login
 

- On the Upper right corner, click the Gear symbol for Settings, followed by the Automatic Replies option
 

- Click option Send automatic replies & Send automatic reply messages to sender outside my organization and type in your away message in both fields. Followed by OK to save changes
 

- To turn off the Out of Office, simply check Don’t send automatic replies and OK