When you have different e-mail client programs or e-mail devices in your Microsoft Exchange Server 5.5 organization, you may experience the following symptom. For users who use these different programs or devices, meetings are automatically moved one hour ahead or one hour behind during the last week in October.

This problem occurs when all the following conditions are true:

• Users in your organization use different e-mail clients such as Microsoft Outlook and Outlook Web Access. Or, some users use devices such as Research In Motion (RIM) BlackBerry devices.
• Your organization is configured to use the Coordinated Universal Time (UTC) time zone. (Coordinated Universal Time is also known as Greenwich Mean Time).
• The month of October has five Sundays.

In the UTC time zone, daylight-saving time occurs on the last Sunday in October. However, a code defect in Exchange Server 5.5 causes the daylight-saving time adjustment to occur on the fourth Sunday in October. This code defect causes an incorrect daylight-saving time adjustment to occur for the years that have five Sundays in October. For example, for client programs that use Collaborative Data Objects (CDO) to access meeting information, the daylight-saving time adjustment occurs on Sunday October 24, 2004 instead of occurring on October 31, 2004 as you expect.

Note This problem affects the years 2004, 2005, and 2006.

Hotfix Information

A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that this article describes. Apply it only to systems that are experiencing this specific problem.

To resolve this problem, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services phone numbers and information about support costs, visit the following Microsoft Web site:Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

Prerequisites

Because of file dependencies, this hotfix requires Microsoft Exchange Server 5.5 Service Pack 4 (SP4). For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

Restart Requirement

You do not have to restart your computer after you apply this hotfix.

Hotfix Replacement Information

This hotfix does not replace any other hotfixes.

File Information

The English version of this 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 tool in Control Panel.

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

For additional information about how hotfix packages are named, click the following article number to view the article 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, regarding the performance or reliability of these products.