Try starting Outlook once with the /CleanReminders switch. If you need help
using Outlook command line switches, look here:
http://support.microsoft.com/default.aspx?scid=kb;en-us;296192

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Jocelyn Fiorello
MVP - Outlook
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> Each time I close and reopen Outlook's calendar, old appointments
> reminders that I have dismissed reappear each time I open the
> calendar for several hours. These are reoccuring appointments.