Here is a quick example of how to disable to Lync / Skype for Business User
Open Windows Power Shell – In my case I use Windows Powershell ISE – These steps need to take place on the Lync server host itself.
# Example: disables Lync user account # Lync now known as Skype for Business Get-CSUser -Identity "Jermal Smith" Disable-CsUser -Identity "Jermal Smith"