In order to address time zone changes, this tool will help adjust calendar items in Outlook after the operating system has been updated with new time zone definitions. While this tool is being released in advance of the U.S. Daylight saving time rules change in 2007, it can be used for general adjustments of calendar items based on changes in time zone definitions saved in Windows or by the user making a permanent move to another time zone.
Download : Microsoft.com/downloads