The Exchange Server 2003 Store.exe process uses up to 100 percent of CPU resources, and Outlook clients receive error 0x8004060c (922768)

SYMPTOMS

In an environment that is running Microsoft Exchange Server 2003, you may randomly experience the following symptoms:

The server that is running Exchange Server experiences up to 100 percent CPU usage. In this situation, the Store.exe process uses most of the CPU resources.
Many e-mail messages are queued in Exchange Server.
Microsoft Outlook clients may stop responding (hang). Alternatively, Outlook clients may receive the following error message:
Error 0x8004060c

CAUSE

This problem may occur if an Outlook client tries to download an incorrectly formatted e-mail message. In this situation, the download operation fails. However, the download process does not exit. Therefore, the corrupted download request generates many flush requests to Exchange Server.

RESOLUTION

Hotfix information

A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Exchange Server 2003 service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

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, you must have Microsoft Exchange Server 2003 Service Pack 2 (SP2) installed to apply this hotfix. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

836993 How to obtain the latest service packs for Exchange Server 2003

Restart requirement

You do not have to restart the computer after you apply this hotfix. However, all the following services are automatically stopped and then restarted when you apply this hotfix:

The Microsoft Exchange Information Store service
The IIS Admin Service
The Microsoft Search service
All services that depend on these services

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 item in Control Panel.

File name	File version	File size	Date	Time	Platform
Exosal.dll	6.5.7651.36	70,144	13-Jul-2006	20:37	x86
Mdbmsg.dll	6.5.7651.36	3,372,544	13-Jul-2006	19:47	x86
Store.exe	6.5.7651.36	5,258,752	13-Jul-2006	20:40	x86

MORE INFORMATION

For more information about the standard terminology that is used to describe Microsoft software updates, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates

For more information about the naming schema for Exchange Server software updates, click the following article number to view the article in the Microsoft Knowledge Base:

817903 New naming schema for Exchange Server software update packages