It's tricky...basically you have to switch back to EST temporarily, export
the calendar items to a file, then switch to MST and import the items back
in. The following article explains the process -- it says Outlook 2000 but
it applies to all versions. http://support.microsoft.com/?kbid=197480

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Jocelyn Fiorello
MVP - Outlook
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>I recently moved from the Eastern Time Zone,and therefore switched my
> computer to Mountain Time Zone. Calendar events (birthdays, holidays,
[quoted text clipped - 4 lines]
> appear only on the given day in the Mountain zone (e. g. Christmas on
> December 25th only).