Slack’s top executive reportedly thinks his company’s work messaging platform will assert dominance over traditional work email in the coming years.

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During an interview with CNBC on Thursday, which shared a clip of the exchange, CEO Stewart Butterfield was asked the question: “When will we end the world of email as we know it?”

“Inside our companies, I think that’s happening faster and faster,” Butterfield replied. He said he anticipates a quicker switch could happen in “the next five to seven years.” But email as a whole “will stick around,” he added.

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