Opening Public Folder Calendar Item places item automatically into Personal Folder Calendar

I have a mail-enabled public folder calendar.  Appears that when someone sends an appointment to the public folder calendar - the entry is added just fine.  If any other user opens this item from the public folder calendar, the appointment is added to that user's personal calendar automatically.  I cannot find any reason for this.
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The reason for this is that the appointment is actually an email, containing details for the calendar entry.  Outlook automatically adds these details to your default calendar when you open the email.  I don't think there's any way to fix this without breaking the default outlook calendaring functionality (although if you wanted to do that, the solution most likely lies with editing the default outlook forms)
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