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Recent updates to Outlook 2007 changed the behavior of tasks in the
reminder window. In the past, reminders that fired at 10 AM showed due at 10
AM in the reminder window and an hour overdue at 11 AM.
Now, the reminder window shows the tasks due at the end of the workday (set
in Tools, Options, Calendar options) so the same task that was overdue at 11
AM is now due in 2 hours.
The screenshots below show where the times are seen.

Updated Saturday January 02 2010