Calendar Processing Issues

Anthony K O365
Anthony K O365 used Ask the Experts™
The following is happening quite ofteh in my Exchange 2003 envirnonemt:

Event ID 8217
The processing of the recurring appointment with the subject "…” in mailbox: John Doe failed with error code 0x80004005.  This appointment will not be visible in the web client or other non-MAPI client

Where should I begin to look?
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The Error Code seams to deal with Offline Adress Book:

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