The U.S. Energy Policy Act of 2005, passed by the U.S. Congress July, 2005, extended Daylight Saving Time (DST) in the U.S. by approximately four weeks. As a result, beginning in 2007, DST will start three weeks earlier on March 11, 2007, and end one week later on November 4, 2007, resulting in a new DST period that is four weeks longer than previously observed. It is possible that this may affect your computer. As usual Microsoft has lots of information to help you through this.

How to know if your affected by this change?

What Products may be affected by the change?

Probably the most common impact most people will see is in Outlook time management and calendars. If you don't update your system properly appointments and events will be one hour off during this period and your all day events will span 2 days. So what to do?

First of all you should update your OS. This may have been completed through the automated update system on your PC if you use that, otherwise you can do so by going to MS update site or directly on this page (be sure to select the correct OS update if you go here).

Second download and run the Time zone update tool for outlook.

This page also has an excellent explanation and details of what to do should you desire to know more. And if you don't like to read and would rather see a visual DEMO go here.

All in all its not that big a deal skipping the process will not render your PC useless but my turn out to be annoying. But given the available resources it is simple to avoid any negative results of the change in the new DST.