Teams, Microsoft’s two-year-old Slack competitor, is the company’s fastest-growing application in its history. That’s something Microsoft has said in the past, but for the first time, Microsoft today also announced actual user numbers for the service ahead of its Inspire partner conference next week. Teams now has 13 million active daily users, Microsoft said, and 19 million weekly active users. Microsoft also today said that Teams is now in use by 91 of the Fortune 100 companies.

The company isn’t afraid of putting those numbers up against Slack, which IPOed only a few weeks ago. Jared Spataro, Microsoft Corporate VP for Microsoft 365, doesn’t mention Slack by name in his blog post, but the company put together a little graphic that clearly shows why it

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