That feeling when you think "we should buy a full page in the Times and publish an open letter," and then you do. ???? pic.twitter.com/BQiEawRA6d
— Stewart Butterfield (@stewart) November 2, 2016
The gist of the rather verbose ad is that Slack invented the enterprise messaging market and Microsoft doesn’t know what it’s getting into. You can find the full text of the back-page ad over at Quartz.