The term “unified communications (UC)” has been around for about 15 years, but it tends to mean different things to different people. For some, UC is still a voice-centric application, and others consider voice an optional component. The comms part of UC is ambiguous enough, but here I will focus on the unified aspect.
I contend the “unified” in “UC” has predominantly become meaningless. Few agree that it’s supposed to describe the client, the server(s), or both. If it’s the client, we see progress, but most of us still have multiple apps for communications.