[taurath]

Skypes main use case isn't business related, and you can tell because they still use freaking Lync on macs

[vertex-four]

Skype for Business is Lync, and has little to do with Skype proper.

[Nothorized]

They also still use Lync on Windows, but it is unusable. Most of the teams in the company I am working for right now are either using Slack or Hipchat.