Daylight-Saving Time:
Daylight-saving time will begin at 2 a.m. Sunday, March 11, and will end a week later than usual, on Sunday, November 4. The change, thanks to a massive federal energy bill passed in 2005 adds extra hours of daylight with the hope of decreasing national energy consumption. Beginning in 2007, daylight saving time will be extended in the United States. DST will start on March 11, 2007, which is three weeks earlier than usual, and it will end on November 4, 2007, which is one week later than usual. This results in a new DST period that is four weeks longer than in previous years. Unless certain updates are applied to your computer, the time zone settings for your computer's system clock may be incorrect during this four-week period. In particular, you must make sure that both your Windows operating system and your calendar programs are updated.

Smart –Phone Customers:
Smart –phone customers should also be updating their devices as well. If they don't update both the mobile device and the computer software it synchronizes information from, scheduled items will be off by an hour. Consumers carrying a mobile phone running on any version of Windows Mobile except the recently released Windows Mobile 6 will have to download software updates from the Microsoft Web site to the devices themselves.

Below you will find a list of popular Microsoft products that are affected by the new daylight saving time zone update.