

Go to Finder > press Command+Shift+G > type in /users//library > delete the following files:.Clear DNS cache: in Command Prompt run ipconfig /flushdns command.If you do not see this folder, check the \Local\Microsoft\Communicator directory. Make sure you’re in the AppData directory and navigate to\Local\Microsoft\Office\15.0 (or 16.0)\Lync\ for Skype for Business and Lync 2013, or \Local\Microsoft\Office\12.0\Lync\ for Lync 2010. Skype for Business, Lync 2010, Lync 2013 for Windows You cannot search for users in Skype for Business.Your Outlook and Skype for Business integration is not functioning properly.You cannot log in to Skype for Business.

Possible reasons why you would want to clear the Skype for Business / Lync cache include: Skype for Business and Lync cache information on Windows or MAC OS X to read information quickly and efficiently.
