Just thought I share with everyone, but I ran into a DST issue with exchange and my phone.
All my appointments (excluding re-occurring and all-day/multi-day events) where shifted by an hour. To make matters worst was that all my appointments on the exchange server were also shifted. I am not sure if my phone shifted the appointments due to DST change, and then sync the changes to Exchange, or if Exchange 2007 has a DST problem with it.
However, I did find this thread
http://forum.ppcgeeks.com/showthread.php?t=113645 which alerted me to the issue.
I am checking with a few of colleagues to see if they have the same issue using our Exchange server.