Topic Last Modified: 2005-11-18

The Microsoft® Exchange Server Analyzer Tool reads the following registry value to determine whether file change notification for the Exchange Installable File System (ExIFS) has been enabled:

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\EXIFS\Parameters\ EnableChangeNotification

If the Exchange Server Analyzer finds that the EnableChangeNotification key is present and configured with a value greater than 0, a non-default configuration message is displayed.

By default, file change notification is disabled for ExIFS. When ExIFS sends change notifications for a file or a directory, it does not clear the cached version of the file or directory. As a result, when an application such as Exchange Server or Microsoft SharePoint® Portal Server receives a change notification and reloads the file or directory, the application gets the cached version and not the newly modified file or directory.

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 revert to the default configuration

  1. Open a registry editor, such as Regedit.exe or Regedt32.exe.

  2. Navigate to: HKLM\System\CurrentControlSet\Services\EXIFS\Parameters

  3. Delete the EnableChangeNotification key.

  4. Close the registry editor, and restart the Exchange server 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" (

For more information about the Exchange Installable File System, see the following: