Meetings are unexpectedly moved one hour ahead in Exchange 2000 Server

When you use Collaborative Data Objects (CDO) to programmatically create meetings in Microsoft Exchange 2000 Server, you may experience the following symptom. Meetings are automatically moved one hour ahead in the last week of October.

This problem occurs when all the following conditions are true:

• Users in your organization use e-mail clients such as Microsoft Outlook Web Access. Or users use other devices or programs that use CDO to view and to manage their calendars.
• 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 CDO 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 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 available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, submit a request to Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

Prerequisites

Because of file dependencies, this update requires both the following:

• Microsoft Exchange 2000 Server Service Pack 3 (SP3). For more information, click the following article number to view the article in the Microsoft Knowledge Base:
  301378 How to obtain the latest Exchange 2000 Server service pack
• The August 2004 Exchange 2000 Server post-Service Pack 3 Update Rollup. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
  870540 Availability of the August 2004 Exchange 2000 Server Post-Service Pack 3 Update Rollup

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 hotfix 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 Microsoft Exchange 2000 Server.