Did you change the time zone settings on your computer or are you in a
location that falls within the new time zone regulations? If so, I suggest
that you let the tool run once; it should not prompt you after this.
If you want it to disable this functionality change (or create) the
following registry key;
HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Outlook\Options\Calendar
Value name: DisableTimeZoneAutoPrompt
Value type: DWORD
Set the value to 1

Signature
Robert Sparnaaij [MVP-Outlook]
Coauthor, Configuring Microsoft Outlook 2003
http://www.howto-outlook.com/
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Real World Questions, Real World Answers
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> Almost everytime I open Outlook I get a message that there has been a time
> change and do I want to update all my calendar entries to reflect the new
> time zone. How do I get rid of this?