The Talko team made awesome contributions to the Erlang AWS library (https://github.com/talko/erlcloud) — huge props for that.
Also, glad we (https://sameroom.io) didn't integrate with them, we almost did.
As far as I know "Skype for Business" is still using Lync's protocols, so your line would still be accurate.
We just released an integration with Lync 2013 (https://sameroom.io/open-a-tube/signin/proxy?type=lync), so we're learning a lot more about this space. Will consider updating the chart :)
Maybe Nadella and Ozzie can work together. We might actually see Microsoft start pushing the boundaries of computing again. Nadella seems like a pretty good collaborator from what I've read.