[dev_throw]

I have witnessed several enterprises move from 100% email to 90% Slack and alternatives while using email primarily for scheduling purposes. I have a feeling corporate email will slowly die off over time.

Perhaps using a community messaging tool with built-in end-to-end Signal encryption will be the way to secure lines of communication in the near future.

[ttul]

Corporate email will become more about interacting with the outside world and less about team interaction. Which makes sense because inside the organization, you have a contained set of actors, whereas outside there are billions (and also apps, mailing lists, etc).