I think everyone is missing the point. Microsoft is moving to restrict the use of their software and services to require the exclusive use of outlook.com email addresses with no exceptions other than shelling out a huge pile of money for enterprise level services.
Supposedly browsers are doing away with third party cookies to eliminate user tracking. Now if all of your OS users are forcibly locked into your email services you can offer guaranteed user identity to advertisers for a price.
"Give us the email address, or mobile number, of our users and we can provide you with their complete history."
This concept has been sold to consumers as way to protect our privacy. It's a lie. It's nothing more than extorting third party advertising networks to pay them for user tracking.
If you haven't noticed yet...the new outlook client only works by requiring you to give Microsoft Cloud services complete access to your email account, then you use your microsoft account in order to view your email that has been consolidated into a single inbox after it has been processed, cataloged, and searched by their servers. And do not forget that your microsoft account has been associated to your real world identity with a credit card and mobile phone number.
End-to-end encryption is starting to look even more appealing every day.
Did I miss something?