https://thenextweb.com/insights/2020/07/22/slack-microsoft-teams-competition-complaint/

Slack is tired of Microsoft‘s attempts to undercut its market. The work collaboration app has filed an anti-competitive complaint against the Windows-maker with the European Commission, accusing the giant of unfairly bundling its Teams messenger with Office 365 and stifling rivals.

“The complaint details Microsoft’s illegal and anti-competitive practice of abusing its market dominance to extinguish competition in breach of European Union competition law,” Slack said in a statement. “Microsoft has illegally tied its Teams product into its market-dominant Office productivity suite, force installing it for millions, blocking its removal, and hiding the true cost to enterprise customers.”