Hiya
Is it Exchange 2000? Have you looked in the Options of Outlook as you can change the time zone there.
It seems that this is a question asked and that it's really only for Calender, though others may know a way. If its calender, there is this:
Display Two Time Zones in Your Outlook Calendar
From Ilene Dunn, Albuquerque, New Mexico
The ability to view two time zones at the same time is very convenient if you plan conference calls or meetings with people in another time zone.
To add another time zone to your Outlook calendar:
On the Tools menu, click Options, and then click the Preferences tab.
Click Calendar Options.
Click Time Zone.
Select the Show an additional time zone check box.
In the Label box, type a description.
From the Time zone drop-down menu, select the time zone you want to add.
If you want your computer clock to automatically make daylight saving time changes, select the Adjust for daylight saving time check box. (This option is available only in time zones that use daylight saving time.)
Regards
eddie