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You use Microsoft Office Communicator 2007 and Microsoft Exchange Server 2003. You schedule a meeting and then cancel the meeting in Communicator 2007. When you do this, the following events may be logged in the Exchange Server 2003 event log:
Event ID : 8239 Category : General Source : EXCDO Type : Error Message : An appointment with the subject "" was saved to mailbox mailbox_address. The start time is missing, so the calendaring agent cannot publish the free/busy information for this appointment. To correct this, please delete the appointment and recreate it.
Event ID : 8206 Category : General Source : EXCDO Type : Error Message : Calendaring agent failed with error code 0x8004010f while saving appointment.
To resolve this problem, install update 951662.
For more information, click the following article number to view the article in the Microsoft Knowledge Base:
951662 Description of the update for Communicator 2007: April 30, 2008
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.