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Outlook 2003 Duplicate Calendar Appointments

I have a user who routinley sends out calendar appointments to everyone in the company (two different distribution lists) and has been complaining that once people start to respond to the invites she will get a message that there is a duplicate appointment and it gives her the option to choose one to keep but no matter which one she selects it deletes both of them.  I've looked all over and can't find a solution, I've seen the articles referencing the Blackberry Server but we do not have one.

The user is using Outlook 2003 with Exchange 2007.  The user is up to date on patches but I don't believe the same is true for the Exchange server however she is the only one that has this problem.
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I'm not sure how this solution got accepted.  I'm just logging on now to check the status of the question.  
Joelsplace, are you saying to turn off cached mode and then turn it back on?  or just turning it off all together?  She does have a phone that syncs but this only happens when she sends out to these distribution lists.  If it happened with every appointment I could see the phone maybe being the issue.
it looks as though deleting and re-creating her ost seems to have done the trick.