Update for daylight saving time changes in 2007 for Exchange 2003 Service Pack 1

An update for daylight saving time (DST) changes in 2007 is now available for computers that are running Microsoft Exchange Server 2003 Service Pack 1 (SP1).

Note Microsoft Exchange Server 2007 does not require a patch to correctly reference DST changes.

Update information

In the spring of 2007, the start dates and the end dates for daylight saving (DST) time in the United States will change to comply with the Energy Policy Act of 2005. The dates will change as follows: A time zone update for DST that will address this issue for Exchange 2003 is now available. This update includes the following:

• The new 2007 DST start dates and end dates for the United States.
• Changes to DST and time zone settings that will occur in Canada in 2007.

Prerequisites

Before you install this update for Exchange 2003, you must install Microsoft Exchange Server 2003 Service Pack 1 (SP1) and the time zone update for Windows. For more information, click the following article numbers to view the articles in the Microsoft Knowledge Base:

Restart requirement

You do not have to restart the computer after you apply this update. However, the Microsoft Exchange Information Store service and all dependent services will be restarted.

File information

The following file is available for download from the Microsoft Download Center:
Download the Exchange2003-KB931978-x86-ENU.exe package now. Release Date: February 08, 2007

For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base: Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file. The English version of this update has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.

Why is the update required for Exchange?

Microsoft calendar software such as Outlook depends on the operating system time zone information to display time information. However, Collaboration Data Objects (CDO)-based programs such as Outlook Web Access depend on separate internal time zone tables. This update modifies these internal time zone tables to match the changes in time zone settings.

Without this update, calendar items in CDO-based programs and in Outlook Web Access will operate as if standard time is in effect during the extra weeks of daylight saving time. For example, without this update CDO-based programs will operate in standard time during the following periods in 2007:

• March 11, 2007 through April 1, 2007
• October 28, 2007 through November 4, 2007

How the update affects other versions of Exchange

Exchange Server 2003 Service Pack 2 (SP2)

This update cannot be installed if you are using Exchange Server 2003 Service Pack 2 (SP2).
For more information about how to obtain a version of this fix that is compatible with Exchange Server 2003 Service Pack 2, click the following article number to view the article in the Microsoft Knowledge Base:

Exchange 2000 Server and Exchange Server 5.5

If you are running Exchange 2000 Server, Exchange Server 5.5, or other earlier versions of Exchange Server, contact the Microsoft account manager or the Technical account manager for more information.

For more information about terminology that Microsoft uses to describe software updates, click the following article number to view the article in the Microsoft Knowledge Base: