(Reuters) — Microsoft said on Tuesday its workplace messaging app, Teams, has more than 20 million daily active users, up from .

The software maker offers the app as part of some Office365 business packages, as well as a free version. Teams allows users to chat, share files, make calls and hold web video conferences.

Microsoft Teams, used by companies such as General Electric and SAP, competes with Slack.

Slack, whose customers include Electronic Arts and Nordstrom, reported more than 10 million daily active users in the second quarter ended July 31.

Slack’s shares fell 8.4% following the news, to $21.18. They are down 45% from the close of their first day of trade in June.

Microsoft Teams also competes with and Cisco’s Webex

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