In August of 2005 the United States Congress passed the Energy Policy Act, which changes the dates of both the start and end of daylight saving time (DST). When this law goes into effect in 2007, DST will start three weeks earlier (2:00 A.M. on the second Sunday in March) and will end one week later (2:00 A.M. on the first Sunday in November) than what had traditionally occurred. Microsoft is committed to working with customers to make this transition as seamless as possible for customers affected by these new time changes. We are further committed to working with others in the industry to address the broader challenges presented by this U.S. statute. Additional Context is available here http://www.microsoft.com/windows/timezone/dst2007.mspx
Impact on Windows Mobile
Devices running Windows Mobile 5.0 and previous versions of Windows Mobile will require an update to change registry settings to adjust the time on the device. Without an update, the device time will be incorrect during the 4 additional weeks of Day Light Savings time this year.
ResolutionMicrosoft has developed a Desktop Utility that can be used to update Windows Mobile devices running Windows Mobile 5.0, Windows Mobile 2003, Windows Mobile 2003 Second Edition. This utility will be available through standard support channels as well as online at http://www.Microsoft.com/windowsmobile/ on February 9th. Also note, that during this same time, there will be a special patch available to update Pocket PC 2002 devices as well. (Note that Windows Mobile 6 is not affected because it already has incorporated the necessary changes).