Skype Developer Platform
msdn.microsoft.com
msdn.microsoft.com
IIRC, NetMeeting also had some cool APIs, allowing you to easily get access to data channels and so on.
It's not pointless. Having one name for your business and consumer products makes things simpler.
The Skype for Business allows external communication though, so... it will be possible to create integrations for regular users, right?
This makes it impossible then.
Great move, Skype and Microsoft!