An update for daylight saving time (DST) changes in 2007 is now available for computers that are running Microsoft Exchange Server 2003 Service Pack 2 (SP2).

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

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Update information

In the spring of 2007, the start dates and the end dates for daylight saving time (DST) in the United States will change to comply with the Energy Policy Act of 2005. The dates will change as follows:

DST	In 2007	In previous years
Start date	Second Sunday in March, 2:00 A.M.	First Sunday in April, 2:00 A.M.
End date	First Sunday in November, 2:00 A.M.	Last Sunday in October, 2:00 A.M.

A time zone update for DST that will address this issue for Microsoft Exchange Server 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 (except in Newfoundland).
•	Changes to DST and time zone settings that have occurred since the products in the "Applies to" section were originally released. For example, this update includes some changes that were previously released as individual updates and documented in articles in the Microsoft Knowledge Base.

Note This update is cumulative. Therefore, if you have not yet applied either of the security updates that are described in the following security bulletins, you may have to change the Send As permissions on your mobile device to make sure that the mobile device continues to function as you expect.

•	MS06-019 (Store.exe version 6.5.7233.69 or a later version of Store.exe)
•	MS06-029 (Store.exe version 6.5.7650.28 or a later version of Store.exe)

For more information about the steps that are required to appropriately update user permissions, click the following article numbers to view the articles in the Microsoft Knowledge Base: If you are using Microsoft Exchange Server 2003 Service Pack 1 (SP1) and you install the MS06-019 security update, Microsoft Entourage and third-party services such as Blackberry or GoodLink may be affected. If you are using Microsoft Exchange Server 2003 Service Pack 1 (SP1) or Microsoft Exchange Server 2003 Service Pack 2 (SP2) and you install the MS06-029 security update, third-party services such as BlackBerry or GoodLink may be affected. For more information, click the following article numbers to view the articles in the Microsoft Knowledge Base:
The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.

Prerequisites

Before you install this update for Exchange, you must install Microsoft Exchange Server 2003 Service Pack 2 (SP2) 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-KB926666-v2-x86-ENU.exe package now. (http://www.microsoft.com/downloads/details.aspx?FamilyId=C16AEA4A-ED33-4CD9-A7C3-8B5DF5471B7A&displaylang=en)
Release Date: January 16, 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.

File name	File version	File size	Date	Time	Platform
Cdo.dll	6.5.7651.61	718,848	14-Dec-2006	23:00	x86
Cdoex.dll	6.5.7651.61	3,945,472	14-Dec-2006	22:15	x86
Davex.dll	6.5.7651.61	1,139,712	14-Dec-2006	22:08	x86
Excdo.dll	6.5.7651.61	3,692,544	14-Dec-2006	22:15	x86
Exoledb.dll	6.5.7651.61	2,616,320	14-Dec-2006	06:08	x86
Exosal.dll	6.5.7651.61	69,120	13-Dec-2006	23:33	x86
Lsmexhc.dll	6.5.7651.61	125,440	14-Dec-2006	21:23	x86
Madfb.dll	6.5.7651.61	525,312	14-Dec-2006	22:15	x86
Mdbmsg.dll	6.5.7651.61	3,375,104	14-Dec-2006	00:16	x86
Rtdsmcal.dll	6.5.7651.61	33,280	14-Dec-2006	21:29	x86
Store.exe	6.5.7651.61	4,879,360	13-Dec-2006	23:37	x86

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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

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How the update affects earlier versions of Exchange

Exchange Server 2003 Service Pack 1 (SP1)

This update cannot be installed if you are using Exchange Server 2003 Service Pack 1 (SP1). For more information about how to obtain a version of this fix that is compatible with Exchange Server 2003 SP1, 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.

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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:

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The review dates for this article may reflect minor editorial or structural revisions to this content. The major technical revisions to this content are listed in the following table.

Date	Revisions
November 15, 2006	Original version
December 26, 2006	Corrected the URL in the "How the update affects earlier versions of Exchange" section
January 16, 2007	The following changes were made to this article: • Updated the title, the "Update information" section, the "Prerequisites" section, and the "File information" section to contain information for version 2 of the DST update • In the "How the update affects earlier versions of Exchange" section, added information that applies to Exchange Server 2003 Service Pack 1
January 17, 2007	Updated the download URL to reflect version 2 of DST update
January 24, 2007	Added a note that states that Exchange 2007 does not require a DST update
January 29, 2007	Removed outdated Exchange 2003 SP1 information in the "How the update affects earlier versions of Exchange" section
January 31, 2007	The following changes were made to this article: • Added Outlook Web Access information to the "Why is the update required for Exchange?" section • Added the "Important" note at the top of the article about potential issues that may affect Outlook
February 11, 2007	Added a note in the "Update information" section about the fact that the DST update is cumulative and about potential complications with Send As permissions and with mobile devices
February 12, 2007	The following changes were made to this article: • Added information about the Exchange 2003 Service Pack 1 version of the software update to the "How the update affects earlier versions of Exchange" section • Replaced outdated cross-references to Microsoft Knowledge Base article 928388 with cross-references to Microsoft Knowledge Base article 931836 • Corrected the note in the "Update information" section about the fact that the DST update is cumulative and about potential complications with Send As permissions and with mobile devices
March 12, 2007	Added Revisions table
March 2, 2007	Revised Revisions table
March 2, 2007	Changed date format in "Revisions" table to long format
March 8, 2007	Changed section heading from "Revisions" to "Technical revisions"
March 21, 2007	Added missing revisions to "Technical revisions" table

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