Exchange Calendar Update Tool
The Exchange Calendar Update Tool enables administrators to update, using the Time Zone Data Update Tool for Microsoft® Office Outlook®, multiple user mailboxes, thereby avoiding the challenges involved with broadly deploying the Outlook Time Zone Data Update Tool to all end-users.
You can get it here: http://www.microsoft.com/downloads/details.aspx?familyid=a9336886-4b28-4010-9416-36d38429438d&displaylang=en&tm
Technorati : Calendar Update Tool, Exchange 2003