When users try to log on or log off a terminal server that is running a Microsoft Lync 2010 client, the Windows session stops responding. Additionally, the users receive the following error message:
"Please wait for the System Event Notification Service"
This issue occurs because the Lync 2010 client uses a legacy Windows API to obtain the Windows logon or logoff event notifications.
To resolve this issue, install the following cumulative update.
Description of the cumulative update package for Lync 2010: June 2012
For more information about the ISensLogon
interface, go to the following Microsoft website: