How to clear the Local Cache
From time to time the support team may ask you to clear your local cache to help resolve a particular issue.
This can be achieved by performing the following steps:
1. First Sign out of Skype for Business.
2. On the Login Screen click, "Delete my sign-in info".
3. Click on the arrow to the right of the cog in the top right and select File > Exit.
3. Open windows explorer and browse to the folder:
%localappdata%\Microsoft\Office\15.0\Lync
%localappdata%\Microsoft\Office\16.0\Lync
(depending on the usage of Skype for Business 15 or 16)
4. You should see a folder with your sip address for example sip_jsmith@joinvia.com
5. Delete this folder.
6. Restart the PC.
7. Log back into Skype for Business.