We've built Seat.im - a professional instant messaging platform for sales. It has really simple client on-boarding as it requires no software and no account registration - with just one click (i.e. in email signature) clients can start interacting with a sales person (IM, video call, screensharing).
Our initial assumption was that both salespeople and their customers want to accelerate communication when working together (email is slow). Initially salespeople we spoke to found it exciting and were happy to try it out, but when running trials we learned that speed of communication isn't a real problem they want to be solved, and immediacy or such availability can actually be harmful for their sales process (i.e. unfulfilled expectations of immediacy results in bad customer experience or inability to prioritize deals etc.).
Can you see other use cases for the product we've built?