Support Ends for Windows XP Service Pack 1 http://go.microsoft.com/?linkid=5159878

Effective October 10, 2006, support for Windows XP Service Pack 1 (SP1) will end. After this date, Microsoft will no longer provide any incident support or security updates. To enhance the security of your computer and to continue receiving updates, we recommend upgrading to Windows XP Service Pack 2 (SP2). To learn more about this upgrade and the free technical support provided to download and install the service pack, visit the Web site http://go.microsoft.com/?linkid=5159908.

You know the answer, if your customers are not on XP SP2, time to move them up.

ttfn

David