You can use Inbox rules to automatically forward messages sent to your mailbox to another account. To set up this rule, follow the instructions below. 

1. Login to your Outlook Web App and click the Settings icon in the upper right corner.

2. Next, click "View all Outlook settings" at the bottom of the Settings pane.

3. In the Settings menu, select Mail, then Forwarding. In the forwarding section, type in your email address to want to forward mail to and select "Keep a copy of forwarded message."

4. Lastly, click Save in the upper-right corner and you are all set!