https://finance.yahoo.com/news/microsoft-offers-businsses-free-version-180017092.html

“We're kind of flipping the model on its head,” said Lori Wright, general manager for Microsoft’s Office 365 collaboration apps. “The competition looks at this as a way to get into enterprises and larger business, but that's a place we've been successful for a long time. To us, this is really about expanding the opportunity down to small and medium-sized businesses who haven't necessarily been Office 365 customers.”

Microsoft previously offered a free version of Teams to educational users. The company said in March that 200,000 organizations use Teams. Slack says it has 500,000 organizations and 8 million active daily users. More than 70,000 customers pay to use Slack, according to the startup.