[Savageman]

It must be a new policy, or maybe only for this product (which makes good marketing).

I've used Microsoft Graph to manage emails, and I'd be very surprised if they use if for Outlook...

[eddythompson80]

Even during Windows 95 it was an old established policy https://devblogs.microsoft.com/oldnewthing/20051116-12/?p=33...

[gpderetta]

dogfooding has been a thing at MS probably since its inception. Of course it doesn't mean it is always practiced fully.