Slack is going to be a crazy $30/person/month when the enterprise version launches next year !

Currently it costs $12.50 per enterprise user per month.

https://paypal.slack.com/pricing/slack-for-teams

not trying to insult you or anything but microsoft probably doesn't really care. make most of their money from contracts with companies with thousands of people.

Yep, not to mention entire cities and state governments. Also, the entire Military and Military Industrial Complex...