What version of Exchange server? There is a known issue with Exchange 2007.
http://support.microsoft.com/default...b;en-us;973761

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Diane Poremsky [MVP - Outlook]
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Outlook & Exchange Solutions Center: http://www.slipstick.com/

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Do you sync your mailbox with a smartphone or pda?
http://forums.slipstick.com/showthread.php?t=39473

"MacTenUS" wrote in message
...
When sending and receiving appointments the reciever is getting a default
reminder for everything. We can shut off the defaults, uncheck the
reminder
before sending and still it defaults to 15 min reminder. With the number
of
appointments that we share, this has become a real pain. Please help with
any
advise and or suggestions.