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I have always felt it's less about email redundancy and more about having a backup plan. If outlook goes down tomorrow, does everyone know how to keep work and client communication moving? that is something worth thinking about.
Who wants to bet that Microsoft is using slack to communicate now?
Fire up that old IRC server!
There was no need to abandon perfectly working technology, with pain some people might learn this. Departmental servers, pesky lordly sysadmins, this was a working sustainable system that even scaled to the phone company and US government levels.
For the amount of uneeded emails about future emails about other emails, probably no real work was lost.