From email address comparison to prevent scams
This is a simple Idea but I think it could help a lot of people from being tricked by scammers. When you receive an email form someone right now Outlook just shows the Name in the from spot. By default it should also show the real email address from the message source that the email was sent from. If that email address doesn't match the persons name's email address in the contact list it should highlight the message and specifically the faked email address so the user is aware. The user then can make a decision as to if this email is garbage or not. Some time the spoof emails will include the real email address in the name field but the actual message source contains the address they are mass mailing out of. This should also be highlighted so the user is aware of this.
In basic Don't just show the persons "Name" from the message headers, show the actual message source from field's email address. This lets the user determine easily if they are trying to phished with a spoofed email address.
James Laws commented
There is a related suggestion that I think should also be voted on: https://outlook.uservoice.com/forums/322590-outlook-2016-for-windows/suggestions/37200739-email-address
You can add a column in views (See below link)
However, this causes outlook to crash. I have spent hours on with Tech Support trying to have this functionality of viewing the sender address.