Vista - Calendar & Time Zone Changes

On the Microsoft Office Outlook Calendar, when you change time zones, all of
your yearly appointments (like birthdays, anniversaries) come up as 2 day
appointments and not 1. Is there a way to fix this or could it be under
consideration for a future update? I notified Microsoft of this last year
and they assured me it would be considered. It is really a pain and
something I feel time should be spent on. I like accuracy and when I change
a time zone in the computer, I don't think this should have an effect on
yearly appointments.
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Eric H