Use rules to automatically forward messages
Please note that this type of forwarding cannot be done from the Outlook Client. You must use Outlook on the Web (Web App).
Forward all messages to another account automatically
Messages that are forwarded will appear to be forwarded from you. When you reply to a message that has been forwarded, the reply will be sent to the address the message was forwarded from, not to the original sender.
Redirect all messages to another account (Preferred Method)
Messages that are redirected will appear to come from the original sender. When you reply to a message that has been redirected, the reply will be sent to the original sender.