There are two updates that must be completed to update Exchange 2003. Three if you haven’t already upgraded to Service Pack 2.
The first is the cumulative time zone update for Windows 2003 Server which can be found at http://support.microsoft.com/kb/931836/.
The second is the Update for daylight saving time changes in 2007 for Exchange 2003 Service Pack 2 which is at http://support.microsoft.com/?kbid=926666.
If you have a Blackberry Server there are no specific patches that are required by RIM on the server itself. There is a patch that needs to be run on the handhelds which can be pushed to the devices from the server. More information is available directly from Blackberry at:
http://www.blackberry.com/select/dst2007/resolutions/enterpriseserver/exchange.
Here’s the PDF that explains how to cofigure the software push to the BlackBerry handhelds from the BlackBerry Server:
http://www.blackberry.com/select/dst2007/Deploying_DST_2007_Update.pdf
It works. I just pushed to my unit as a test.