Fix: Cannot sign in because the server version is incompatible with Skype for Business

To get Skype for Business (Office 2016) working with an older OCS or Lync server create the following registry key and you are good to go.

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Office\16.0\Lync DisableServerCheck (DWORD 32-Bit Value): 1