How to Delete the Skype for Business (Lync) SIP Profile

You cant login on skype, skype stops working

Lync 2010: %UserProfile%\AppData\Local\Microsoft\Communicator\

Lync 2013: %UserProfile%\AppData\Local\Microsoft\Office\15.0\Lync

Skype for Business: %UserProfile%\AppData\Local\Microsoft\Office\16.0\Lync

Rename profile folder make sure Skype for Business/Lync, Outlook and Onedrive are closed down before you rename the folder

Next time you start Skype/Lync it will start creating a new profile folder