You experience memory leaks when your custom program loads and unloads the Mapi32.dll file on Exchange Server 2003

Consider the following scenario. You install the hotfix that is described in the following Microsoft Knowledge Base article to fix memory leaks that you are experiencing in Microsoft Exchange Server 2003:

The memory leaks that you are experiencing are caused by one of the following programs:

• A custom MAPI program
• A Collaboration Data Objects (CDO) program

After you install the hotfix, you may notice that the memory leaks have decreased. However, in this scenario, memory leaks still continue to occur when your custom program repeatedly calls the LoadLibrary and FreeLibrary functions to load and unload the Mapi32.dll file.

Note You can use the Performance snap-in to view the memory leaks in the Private Bytes counter of the program that is experiencing the memory leaks.

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. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

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, contact 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 hotfix requires Microsoft Exchange Server 2003 Service Pack 1 (SP1).
For more 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 software updates.

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 the Microsoft products that are listed in the "Applies to" section.

You must set the CleanUpMAPIHeap registry value to 1 to enable the MAPI heap cleanup code.

For more information, click the following article number to view the article in the Microsoft Knowledge Base: