In 2020, Slack filed an antitrust complaint against Microsoft with the European Commission, claiming its bundling of Teams with the Office suite gave it an unfair advantage (echoing antitrust cases against Microsoft for bundling Internet Explorer with Windows). But today, it faces stiff competition from Microsoft Teams, which has nearly doubled its daily users in each of the past two years. Slack launched in 2013 and quickly established itself as the predominant work-chat app. Planning has been in the works for several months! Just weird timing,” he wrote in an internal Slack channel today, viewed by Business Insider. “FWIW: This has nothing to do with Bret’s departure.

However, Butterfield says the actions are unrelated. The move comes just days after Salesforce announced that its CEO, Bret Taylor, will also leave in early 2023. Lidiane Jones, currently an executive VP at parent company Salesforce, will succeed Butterfield as CEO. Slack co-founder and CEO Stewart Butterfield is leaving the company in January.

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