Consider the following scenario:
- Multiple users sign in to a terminal server by using Remote Desktop Protocol (RDP) sessions.
- Some users sign in to Microsoft Office Communicator 2007 R2.
- Some of them try to log off the RDP sessions at the same time.
This issue occurs because Office Communicator 2007 R2 uses a legacy Windows API to obtain a Windows logon event notification or a Windows logoff event notification.
For more information about the article, click the following article number to view the article in the Microsoft Knowledge Base:
2709670 "Please wait for the System Event Notification Service" error message when users try to log on or log off a terminal server that is running Lync 2010
Article ID: 2782793 - Last Review: Dec 14, 2012 - Revision: 1
Microsoft Office Communicator 2007 R2