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I can see that both Microsoft and Google have tried Slack at least. This doesn't mean they are still using it (vice versa).

Since Skype is not really light-weight anymore and Google chat did not really take off, It looks like that Slack found himself a good spot in between.

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My 'Open Source Strategic Engagements' team at MSFT is totally using it. Slack is awesome. It has a good Skype integration, which is how we can call each other. It's the best chatroom solution I've seen in a while. Skype and Lync are trying to do something else and we're very happily using all of them!

Microsoft have a hell of a lot of teams (separate Slack instances). I'd be surprised if none of them are being used.

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