Microsoft Corp didn’t immediately respond to an emailed request for comment. Slack Technologies Inc, which went public in 2019, has been growing rapidly. It reported $201.7 million in sales in its February-April quarter, up 50% from the same time last year. It also reported 122,000 paid customers, up 28% from when the company went public in April 2019.
Slack still faces tough competition, particularly from Microsoft’s Teams software. Slack last month announced an expanded partnership with Amazon’s cloud computing division, an attempt to join forces with Microsoft’s chief rival. It more recently announced it is buying Rimeto, which creates detailed staff directories. The European Commission will review the complaint and decide whether to open a formal investigation.