A CDO thread may go into an infinite loop when you try to programmatically create an appointment in Exchange Server 5.5 or in Exchange Server 2003

When you programmatically create a new recurring appointment by using Collaborative Data Objects (CDO), your code does not complete the appointment creation procedure. Instead, your program enters an infinite loop.

This problem occurs when all the following conditions are true:

• An all-day recurring appointment already exists on the daylight-saving time transition day.
• The time zone is set to certain non-Coordinated Universal Time (non-Greenwich Mean Time) time zones. For example, the time zone is set to UTC+2.
• You try to create an appointment by using CDO, not necessarily on that daylight-saving time transition day.

In this scenario, a CDO thread may go into an infinite loop when you try to add the new appointment.

Exchange Server 2003

Service pack information

To resolve this problem, obtain the latest service pack for Microsoft Exchange Server 2003. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

Exchange Server 5.5

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

You must have Microsoft Exchange Server 5.5 Service Pack 4 (SP4) installed to install this hotfix. 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 install this hotfix. However, the World Wide Web Publishing Service and all its dependent services are automatically stopped and then restarted during the installation of this hotfix. After you install this hotfix, verify that all necessary Exchange services have been restarted successfully.

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) 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.
This problem was first corrected in Microsoft Exchange Server 2003 Service Pack 2.

For additional information about how hotfix packages are named, click the following article number to view the article in the Microsoft Knowledge Base: