https://qz.com/1325993/microsoft-is-putting-slack-on-notice/

Microsoft announced that it’s launching a free version of its Teams software today, July 12.

The company first introduced Teams last year as its answer to the communication tool Slack that has swept workplaces across the US, and raised reams of cash in its short history. Slack currently has around 8 million daily users, 3 million of whom are paid subscribers.