Many people will be aware of Skype as a consumer service, but it doesn’t support conference calls or screen sharing and is generally considered a home user product.
However, when Microsoft took over the company, they set about creating a commercial offering for business, and that’s where Skype for Business comes in. Microsoft combined Lync (formerly Microsoft Office Communicator) with Skype’s user friendly interface, to create a service that is both easy to use and has features that businesses need.
Perhaps users simply wish to keep their personal skype account separate to their business? Skype for Business could be the answer.