In my experience, a half dozen of our power-user secretaries received the patch. they started updating calendars for executive staff. Started noticing the issue with the extended DST period.
Within days, I ran all the updates for OS, distributed workstations, exchange and also the calendar update tool.
It automatically solved the issues. Part of the tool is designed to find exactly what you're describing.
It worked for me. Your mileage may vary.
However, again, I was Exchange 2003 SP1 and Windows XP/Windows 2000 workstations. No Exchange 2000 in my environment.