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Or they could just leave it as is or rebrand it as Slack enterprise until they build a new version based on Slack.

the UI/UX is so different I'd be very surprised if they managed that

See SKYPE for Business. replace('Lync', 'Skype') probably...

Oh Mircosfot's strategy is the weirdest: OCS, Lync, Skype, Skype for Business, Teams, Yammer... People are just lost.

Nayego is trying to hard build a HipChat-like client+server that is open source and based on XMPP. https://nayego.net/ you can subscribe if you want to see a preview.

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