How? With a young company called Slack.
FORTUNE -- Stewart Butterfield hasn't had a hit since Flickr, the photo-sharing site he sold to Yahoo (YHOO) back in 2005. But with Slack, his newish company's latest offering, the serial entrepreneur thinks he's on to something big -- a potential replacement to clunky, cumbersome e-mail systems.
"When I first started making software everything was Microsoft (MSFT)," says Butterfield. "Now every company has its choice MOREImage may be NSFW.
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