Microsoft has launched a messaging system for businesses, Microsoft Teams, putting it in direct competition with fast-growing startup Slack and Facebook Inc's Workplace product.
The new software will be part of Microsoft's Office 365 services, a cloud-based software suite that has more than 85 million monthly active commercial users.
Slack, whose customers include CBS Corp, BuzzFeed, universities and the US government, had over 4 million daily active users in October.
San Francisco-based Slack took out a full page ad in the New York Times on Wednesday, addressing the entry of Microsoft Teams.
"We're genuinely excited to have some competition," Slack said in the ad.
Microsoft said a preview of Teams will be available to Office 365 commercial customers with enterprise or business plans, starting on Wednesday.
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