In case you haven’t noticed, the US has approved a plan to change DST to the second Sunday in March. The time also falls back the first Sunday in November. Older Microsoft operating systems will need an update and from what I see right now, there are updates for Windows XP SP2 and Windows Server 2003 and Windows Vista comes with support for the new standards built in. I can’t find any other support information on other Microsoft operating systems. If I find information on the other Microsoft operating systems, I’ll pass it along.
The knowledge base article (Article ID 928388) can be found here and all the links for the downloads are contained within it.