Well… my favourite joke is that “Skype for business” isn’t “Skype”, and it isn’t “for business”.

Skype for business isn’t Skype, underneath its actually Lync the replacement for Microsoft Communicator. And to use it, you needed the other party to install software on their computer - which can rarely be done by standard non-admin business users.

So adoption was really low, which mean the app just never was improved.