The EU's interest in Microsoft's productivity tools stems from a complaint from another platform, Slack, made back in 2020, which said that Teams was being "force installed" for Office customers. Launched in 2017, Microsoft developed Teams as an alternative to Slack, now owned by Salesforce, in the workplace communication space, and it boomed in popularity during the Covid-19 pandemic. It has more than 270 million daily active users, compared with Slack's 20 million.