Microsoft KB Archive/254606

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XADM: How to Enable Additional Information Store Logging

Article ID: 254606

Article Last Modified on 10/27/2006


  • Microsoft Exchange Server 5.5 Standard Edition

This article was previously published under Q254606

IMPORTANT: This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:

256986 Description of the Microsoft Windows Registry


You may need to enable additional Microsoft Windows NT Performance Monitor information store logging for troubleshooting purposes.


To enable additional Performance Monitor information store logging, you need to edit the registry:

WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.

  1. Start Registry Editor (Regedt32.exe).
  2. Locate the Library value under the following key in the registry:


  3. On the Edit menu, click String, change the value from c:\exchsrvr\bin\mdbperf.dll to c:\exchsrvr\bin\mdbperfX.dll, and then click OK.
  4. Quit Registry Editor.

After you modify this registry value, you must restart Performance Monitor to see the new counters. The new counters are located under the MSExchangeIS object.

Additional query words: enhanced extended performance monitor

Keywords: kbinfo KB254606