I agree, the core of the enterprise suite of Microsoft is still very much based on domain controllers and Exchange. This enables the needs for user management a

I agree, the core of the enterprise suite of Microsoft is still very much based on domain controllers and Exchange. This enables the needs for user management and access policy configuration. Where I live self-hosting with Exchange is still the usual way too. No serious company would ever use Gmail. I wouldn't use my corporate account for private mails though. It is used to register at services and interdict the spam.