Microsoft KB Archive/174354

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The information in this article applies to:


 * Microsoft Exchange Server, version 5.0 Service Pack 1
 * Microsoft Exchange Server, version 5.5

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IMPORTANT: This article contains information about editing the registry. Before you edit the registry, make sure you understand how to restore it if a problem occurs. For information about how to do this, view the "Restoring the Registry" Help topic in Regedit.exe or the "Restoring a Registry Key" Help topic in Regedt32.exe.

SYMPTOMS
After you install Microsoft Exchange Server 5.0 and reboot the server, the following error may occur in the application event log:

  Event Id: 1191 Source: MSExchangeIS Type: Error Description: The total number of threads configured for the message store(25)appears to be too small for the current store configuration. Using 27 threads instead. NOTE: The thread numbers may vary depending on the case.

WORKAROUND
To work around this problem, perform the following steps:

WARNING: Using Registry Editor incorrectly can cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk.

For information about how to edit the registry, view the "Changing Keys And Values" Help topic in Registry Editor (Regedit.exe) or the "Add and Delete Information in the Registry" and "Edit Registry Data" Help topics in Regedt32.exe. Note that you should back up the registry before you edit it.

 Enter the Registry Editor (Regedt32.exe).  Go to the following key:   HKEY_local machine\system\current control set\services\MSexchangeIS\parametersSystem   In the right pane, highlight the following:   Minimum Threads : REG_DWORD : 0x3  From the Edit menu, click DWORD and change the Data value to 3. Click OK and exit the registry and then stop and start the information store.

NOTE: The above registry entry should stop the Event 1191. However, if after modifying the key the Event 1191 reoccurs, you may need to increase the following key:   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeIS\ParametersSystem \Background

MORE INFORMATION
For more information, please see the following Microsoft Knowledge Base article:

"Q168308 XADM: Event ID 1191: Total Number of Threads Too Low" Keywords         : XADM Version          : WinNT:5.0 SP1 Platform         : winnt Issue type       :
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