Not sure how @msn.com emails work, but currently with Office 365 everything is also in the cloud before downloading to Outlook, also synced to the cloud.
If they do not mind you have access to the email account they could give you the login in details and you can log and add his account to your mail program. You might need his phone though for verification. I know every time I set my work email through Office 365 I get a text to verify it is me and need to enter that code in the new device to authorize it.
If you are neutral in situations of injustice, you have chosen the side of the oppressor. If an elephant has its foot on the tail of a mouse and you say that you are neutral, the mouse will not appreciate your neutrality. Bishop Desmond Tutu