P.S.

Windows XP SP1 users are on their own, since that first service pack is no longer supported by Microsoft. Windows 2000 users, however, can download a tool to update the clock manually. You'll find more information and links to the downloads on Microsoft's daylight saving time support page at http://support.microsoft.com/gp/dst_topissues#A6a.

Windows Mobile users can go to a similar support page, with links to patches http://docs.info.apple.com/article.html?artnum=305056.

If you're using Vista and Microsoft Outlook Office 2007, you've got nothing to worry about. If you're running Windows XP SP2, with automatic updates turned on, a patch has already been pushed to your system.