Hello...
BACKGROUND
As you may know, timestamps in Windows NT are stored in GMT (Greenwich Mean Time). They are merely DISPLAYED using an offset. The offset is your time zone's standard offset with an optional adjustment for daylight savings time (DST).
WHY YOU ARE HAVING A PROBLEM
Surely what is going on here is the clock display on the workstation and server is doing the DST adjustment correctly and reporting the correct local time. However, Exchange is not putting the correct time on the messages.
WHAT TO DO
1. I looked but could not find a specific fix for this problem. I suggest you ensure your Exchange server is running the latest patches.
2. Look for an option in Exchange to "Automatically Adjust for Daylight Savings Time". Many Microsoft programs have this as an option including Windows itself and the Outlook client.
-----Steve Jackson
CEO/CSA
Software Corporation (Softcorp)
http://www.softcorp.us/probono
Advanced pro bono tools and utilities free for personal use