Have you tried clearing the Forms Cache? In Outlook 2007, Tools->options->other->advanced->custom forms->manage forms->clear cache.

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Milly Staples [MVP - Outlook]
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After furious head scratching, Chadpassesgas asked:
| When I attempt to add anything to my outlook calender I get a message
| "item not save. Not implemented. " I have atttempted to fix and
| resolve all possibilites using office tools. and online help with no
| success? any help?? Chad