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The problem is a 2002 bug the normal fix is to change the time
of the clock back by one minute and the alarms should start to work again.
The reason it is happening is that you have a corrupt calender reminder stalling the system.
In Outlook try the following,
1. Click START
2. Click RUN
3. Enter: outlook /cleanreminders
This apparently cleans up any potential corrupt reminders in the Outlook data.
awarner Microsoft MVP Mobile Devices & Staff Team Leader modaco.com
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