Microsoft KB Archive/841270

= The Microsoft Exchange Information Store service may intermittently stop responding on a public folder server that is running Exchange 2000 Server =

Article ID: 841270

Article Last Modified on 10/26/2006

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APPLIES TO


 * Microsoft Exchange 2000 Server Standard Edition

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SYMPTOMS
The Microsoft Exchange Information Store service may intermittently stop responding (hang) on a public folder server that is running Microsoft Exchange 2000 Server.



CAUSE
This problem may occur if the following conditions are true:
 * The public folder server is under a heavy load.
 * Many users are subscribed to parent folders of particular subfolders for public folder update notifications. Or, many users are subscribed to the root public folder for public folder update notifications.



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 Microsoft 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, this software update requires 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

Restart requirement
You do not have to restart the computer after you apply this hotfix. However, many Exchange-related services are automatically stopped and then restarted when 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.   Date         Time   Version            Size    File name --  25-Mar-2005  13:19  6.0.6617.58     2,342,912  Mdbmsg.dll 25-Mar-2005 14:12  6.0.6617.58     4,706,304  Store.exe



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.



MORE INFORMATION
When Exchange 2000 sends public folder update notifications, Exchange 2000 first estimates the number of users who are subscribed to a particular public folder to determine whether to use a link list or a hash table to send public folder updates. Exchange 2000 only uses the users who are subscribed to the particular public folder when it makes this calculation. However, Exchange 2000 should also consider the users who are subscribed to the parent folder or to the root public folder when Exchange 2000 makes this calculation. Therefore, Exchange 2000 may incorrectly use a link list to send public folder updates instead of a hash table if all the following conditions are true:
 * The public folder server is under a heavy load.
 * There are many users who are subscribed to the parent public folder of a folder that Exchange 2000 is parsing.
 * A particular timing condition occurs

If Exchange 2000 does not consider the users who may be subscribed to the parent folder or to the root public folder, the Microsoft Exchange Information Store service may stop responding while it generates public folder update notifications.

Additional query words: XADM

Keywords: kbqfe kbhotfixserver kbfix kbexchange2000presp4fix kbbug KB841270

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