https://techcrunch.com/2020/03/19/microsoft-teams-jets-to-32m-daus-announces-new-features-as-remote-work-booms/

Today Microsoft announced that its Teams product, a Slack competitor and likely beneficiary of the COVID-19 remote work boom, has reached 32 million daily active users (DAUs). The new figure represents a huge gain on the number Microsoft shared in November 2019, when the product had 20 million DAUs.

Slack, Microsoft’s arch-rival in this particular niche of the productivity space, last announced 12 million DAUs in October of 2019. Of course, as Slack has also grown since the start of Q4 2019, that figure is dated.