Topic Last Modified: 2005-11-18

The Microsoft® Exchange Server Analyzer Tool reads the following registry entry to determine whether debugging has been enabled on the Microsoft Exchange Information Store:


If the Exchange Server Analyzer finds that a value has been set for AssertOnEvent, the Exchange Server Analyzer displays a warning.

The AssertOnEvent registry value holds decimal values that specify which store events should trigger the debug mode of the Microsoft Exchange Information Store. The AssertOnEvent registry fires only when the debug version of store.exe is running. The Microsoft Exchange Information Store uses many resources when it runs in debug mode. It is not a best practice to debug the store in a production environment.

Unless you are actively troubleshooting an Exchange Information Store issue with the aid of Microsoft Product Support Services, you should delete the AssertOnEvent registry value.

This article contains information about editing the registry. Before you edit the registry, make sure you understand how to restore the registry if a problem occurs. For information about how to restore the registry, view the "Restore the Registry" Help topic in Regedit.exe or Regedt32.exe.
To delete the AssertOnEvent registry key
  1. Open a registry editor, such as Regedit.exe or Regedt32.exe.

  2. Navigate to: HKLM\System\CurrentControlSet\Services\MSExchangeIS\ParametersSystem

  3. In the right pane, locate and delete the AssertOnEvent value.

  4. Close the registry editor, and restart the Microsoft Exchange Information Store service for the change to take effect.

Before you edit the registry, and for information about how to edit the registry, see the Microsoft Knowledge Base article 256986, "Description of the Microsoft Windows registry" (