https://techcrunch.com/2020/07/22/slack-has-filed-an-antitrust-complaint-against-microsoft-teams-in-the-eu/

Workplace instant messaging platform Slack has filed an antitrust complaint against Microsoft in the European Union accusing the tech giant of unfairly bundling its rival Teams product with its cloud-based productivity suite.

A spokeswoman for the Commission’s competition division confirmed receipt of a complaint, telling us via email: “We confirm that we received a complaint by Slack against Microsoft. We will assess it under our standard procedures.”