
In your Login keychain, delete all e-mail address certificates.Delete all keychains starting with OC_Ke圜ontainer.Open Keychain Access from /Applications/Utilities folder.Go to Finder > press Command+Shift+G > type in /users//documents > navigate to Microsoft User Data > delete the following folders: Microsoft Lync Data and Microsoft Lync History.


If you do not see this folder, check the \Local\Microsoft\Communicator directory. Select Open at Login to remove the checkmark. 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: Open the Start menu Type Control Panel Select Programs and Features Search Skype for Business right click and select Uninstall. Skype for Business and Lync cache information on Windows or MAC OS X to read information quickly and efficiently.
