Lync is now Skype for Business... I mean in the splash and window title because the executable is still "lync.exe".
Ah, Skype for Business. Which can't actually call other Skype accounts, and requires a desktop executable if you want clients to be able to call you. Meaning it is neither "Skype" nor is it useful "for business".
Reminds me of the joke about the "Holy Roman Empire."
S4B really has nothing to do with Skype. It's a VOIP phone with a half-baked SIP client that connects to AD and Exchange.
Very useful for organizations replacing phone workflows, not useful for replacing conferencing and chat workflows.