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Event ID: 8260 Source: EXCDO

Source
Level
Description
An attempt was made to save an appointment with the subject <subject> to mailbox <mailbox>. The duration of the appointment was too large so it was not saved.
Comments
 
As per Microsoft: "This Warning event is logged when Microsoft® Exchange Server cannot save a repeating appointment that has a duration of more than two years (730 days). The subject of the appointment and the mailbox name is specified in the event description". See MSEX2K3DB for information on fixing the problem.

From a newsgroup post: "I had this problem about a month ago and it took some work to track it down. It turned out that a MAC user on my network had upgraded his version of OSX and it somehow messed up the synchronization process between his PDA and the workstation, which was synchronizing Entourage to my Exchange server. The errors appeared whenever he began the synchronization process or opened his Inbox. He had to update some of the software on the PDA before the synchronization would complete, and then the errors disappeared".

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