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Slack cofounder Cal Henderson says having Microsoft become your top competitor is like when 'you slowly boil a frog'

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Slack chief technology officer and cofounder Cal Henderson. Slack
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Slack, a $7 billion workplace messaging company launched five years ago, now has the nearly trillion-dollar Microsoft as its biggest competitor. And it's not a one-way street — Microsoft sees Slack as a threat.

This didn't happen overnight, Slack's chief technology officer and cofounder Cal Henderson said Monday at Business Insider's IGNITION conference in New York.

"The whole experience over the last few years has been like when you slowly boil a frog," Henderson said onstage. "They don't realize the water is getting hotter and hotter."

In August, Slack raised a massive $427 million that valued it at $7.1 billion, and it's not backing down. At the same time, Microsoft has been working to promote its own office messaging product, Microsoft Teams.

Still, having Microsoft as a competitor can be a good thing for Slack.

"It's huge validation when a huge competitor like Microsoft enters the same space and builds a similar product," Henderson said. "They're saying, this is a product space that will continue and be important and enter into the next decade."

Since Slack started in 2009, the company has grown immensely. The first year and a half of the business was just building the product, and Henderson says his role has changed immensely from then to now.

Once you're sick of saying it, people start listening

"Once you build a product that fills the need that people need, then you can turn it into a business," Henderson said, adding: "My role as a leader largely becomes one of delivering priorities and vision. Once you're really sick of saying that, that's when people really start to hear it."

The key, Henderson says, is to believe that "you're definitely going to be successful."

"You have to believe this, even in the case of evidence like, all the odds are against you, but this time around, you're definitely going to be successful," Henderson said.

Read more: Microsoft is acquiring a Texas-based artificial-intelligence startup as it prepares for the next wave of the cloud wars

Now that companies such as Slack, Microsoft, and Google are vying for the top spot in office messaging, it shows how enterprises are increasingly working to increase communication. While Henderson said these apps could increase teamwork, he suggested they couldn't match the value of in-person communication.

"Face-to-face communication is still so rich," Henderson said. "That's never going to replaced by technology and media. We still get together when we can."

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Rosalie Chan
Rosalie Chan is a senior editor for Business Insider's tech team. Previously, she covered cloud computing and enterprise tech, reporting on companies like Google Cloud, Amazon Web Services, Microsoft, Intel, Alibaba Cloud, Atlassian, GitHub, VMware, Broadcom, and more. She has written extensively on topics including cloud computing, developer companies, open source, and sexism and sexual harassment in the tech industry. She has received the San Francisco Press Club award for continuing coverage for her reporting on sexism and sexual harassment in Silicon Slopes and the Excellence in Business / Consumer / Tech Reporting award from the Asian American Journalists Association for her investigation into the coding boot camp Holberton School. Most recently, she was an editor on the Business Insider investigative package, The True Cost of Data Centers, which received a George Polk Award and an honorable mention from SABEW.Rosalie joined Business Insider after working as a software engineer and freelance journalist. She studied journalism, computer science, and technology and business law at Northwestern University. Her work has previously appeared in TIME, the Huffington Post, VICE, Pacific Standard, Inverse, Chicago magazine, the Chicago Reporter, and more. She's based in San Francisco.