User unable to view the application sharing in the SfB Client

Issue Description: 

When User had P2P/Conference call and when other share their applications/desktop, the user is unable to view.

Check in Event Viewer:

When issue occurs, in the event viewer you will see the event ID 301 in Microsoft Office Alerts

Resolution:

1      Take a backup of the registry (Export Range: All)

2      Check below locations for CLSID {00000000-0000-0000-0000-000000000000}

HKEY_LocalMachine\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\ActiveX Compatibility\{00000000-0000-0000-0000-000000000000}

HKEY_LocalMachine\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\{00000000-0000-0000-0000-000000000000}

3    If you find this CLSID {00000000-0000-0000-0000-000000000000} in the above locations, then delete the registry keys.

This will fix the application sharing issue.