The Exchange Calendar Update Tool enables administrators to avoid the challenges involved with broadly deploying the Outlook tool to all users and ensuring that each user runs the tool correctly. On August 8, 2005, the United States Congress passed and President George W. Bush signed into law the Energy Policy Act of 2005. Among other changes, this act modifies the start dates and the end dates for daylight saving time (DST) in the following geographic regions: all of the United States except Arizona, Hawaii, Puerto Rico, the U.S. Virgin Islands, and American Samoa. (Date Published: 2/21/2007; Version: 2.0) download the tool