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Event ID: 8239 Source: EXCDO

An appointment with the subject "<calendar item>" was saved to mailbox <mailbox name>. 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.
To resolve this problem, install update ME951662 for Microsoft Office Communicator 2007.
ME298924 shows information on issues caused by a back-up or by a scan of the Exchange 2000 M drive.
From a newsgroup post: "This is a known problem - and it is an unfortunate result of scanning the M: drive using an AV file-level software.

The problem is really that items get changed when they are scanned. Because of that, the information store and/or Outlook client can not read them properly anymore.

There were two hotfixes that MS came out with to enable databases that were scanned like this to be seen again through Outlook properly:

1. Install Exchange 2000 SP2.
2. Install Outlook patch on your clients - Outlook 2000 and 2002".
See ME302456, ME302849, and ME302852.

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