[the_third_wave]

> But that's all beside the point being made here. The point is that federation is not why email was successful, or why it persists. It was just an implementation detail of a capability that was fundamentally novel to most people when they first came across it.

Nope, hard disagree there. If the mail-related protocols had not been federated - i.e. had email relied on a single-source centralised server - it would not even have survived into the 90's. It would have come up against a host of commercial competitors and eventually would have succumbed to some "Microsoft Network"-like thing which would have come pre-installed on Windows 95. Only Greybeards would use email, the latte sipping set would use Apple Mail, most of the rest would use whatever Microsoft presented them with. That was the original intent of the Microsoft Network as described in the first (hardcover) edition of Gates' book "The Road Ahead" [1] in which he envisaged a future where the internet gave way to the "Information Superhighway" based around proprietary technologies.

[1] https://en.wikipedia.org/wiki/The_Road_Ahead_%28Gates_book%2...