"Bottom line: this could be a good move for Amazon in terms of upping their game in the enterprise collaboration market, but the devil is in the details of staying power and execution versus competitors like Google, Microsoft and Facebook," said Forrester analyst Art Schoeller.

Bloomberg News reported last week that Amazon is considering the move in a deal that could be valued at $9bn.

A Slack official declined to comment on the report. Amazon did not respond to a request for comment.

Slack has more than 5 million daily users, and has seen widespread adoption since its inception three years ago. More recently, Microsoft was thought to be eyeing the company, but backed away from a deal when it determined the price — possibly as much as $8bn — was too high, Schoeller said.

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