Businesses that use Microsoft’s Office 365 web-based productivity suite will see the new workplace-messaging application appear starting Tuesday. The app will challenge startup Slack’s hot software.

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Microsoft is taking the Bubble Wrap off its challenge to startup Slack’s white-hot workplace-messaging software, officially launching Microsoft Teams.

Businesses that use Microsoft’s Office 365 web-based productivity suite will see the new application appear starting Tuesday, the company says.

The Redmond company’s would-be Slack killer, built in the past two years, enters a more crowded market than when it was introduced in a preview version a few months ago.

Google has come calling. Microsoft’s nemesis has redesigned its Hangouts chat app with Slack-like features, unveiling the new concept at a company event this past week. Facebook is also in the midst of a push to sell workplace collaboration tools.

At stake is the fast-changing realm of business communication, which, in addition to staples like email, has come to include digital messaging services and voice and video calls often handled over the internet instead of using telephone infrastructure.

Research firm Gartner estimates that businesses worldwide will spend $5.1 billion on web conferencing, collaboration and social tools in 2017.

Microsoft Teams, like Slack, allows users to set up running chat rooms with individuals or groups of colleagues, silo conversations in expandable threads, and share files.

Microsoft’s Office, a dominant software brand among information workers, is under attack from companies like Slack that take aim at a single area of workplace tools, as well as from broad assaults by the likes of Google and Amazon.

Google is working to leverage its dominant position with a generation of internet users to build a brand for its business apps, redoubling its efforts to sell the G-Suite productivity platform.

Amazon, meanwhile, is trying to expand its reach from developer tools to workplace applications, a portfolio that has come to include email, calendars and workplace communications tools.

Microsoft has tried to hold its ground by packing Office 365 with new features, some of which, like Teams, come at no extra charge.

The company says Office 365 has more than 85 million users. And, changing the measuring stick in marketing materials Tuesday, Microsoft said “more than 50,000 organizations” had plugged into Teams during the service’s five-month preview period. That tally includes Alaska Airlines, ConocoPhillips and Expedia, Microsoft says.

Bryan Goode, a marketing manager with the Office 365 group, said in an interview that the company was committed to its new product.

Microsoft developers have added about 100 features to Teams during its preview, and plan to add an equal number during the next three to four months, he said, including tighter integration with Outlook and the ability to invite people outside a company to chats.

“We are not slowing down,” he said.