More detail is needed. Are you on a corporate BES server? There are some issues with the process on the BES service. If the Z10 is on a BIS and you have checked to insure old calendar appointments are either deleted or archived then it may be a new bug you have found in the new OS. Rim does not list any issues I could find.
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9810 BES Z10 on BES 9700 BIS
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