Topic Last Modified: 2007-01-05

The Microsoft® Exchange Server Analyzer Tool reads the following registry entry to determine whether the Background Cleanup registry value is present:

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\MSExchangeIS\<ServerName>\Public-<PublicStoreGUID>\Background Cleanup

If the Exchange Server Analyzer finds that the Background Cleanup value is missing, a warning is displayed.

If the Background Cleanup value is missing, the background cleanup process does not occur and numerous issues may be encountered, including:

It is recommended that Background Cleanup is set to the default value of 60,000 (decimal) or 0xEA60 (hexadecimal).

Following the procedure below to correct this warning can result in an increased load on your server until background cleanup has completed for all items that would have normally been cleaned up on a regular basis. Therefore, it is recommended that you make these changes at a time during which users will be minimally impacted. Additionally, if messages for which read receipts were requested have been deleted without being read and have not been cleaned up due to this issue, unread receipts will be generated for each of those messages after you correct this warning.
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 correct this warning
  1. Open a registry editor, such as Regedit.exe or Regedt32.exe.

  2. Navigate to: HKLM\System\CurrentControlSet\Services\MSExchangeIS\<ServerName>\Public-<PublicStoreGUID>

  3. Create a DWORD value called Background Cleanup with value data of 60000 (decimal) or 0xEA60 (hexadecimal).

  4. Close the registry editor. To make the changes take effect, do one of the following:

    • Dismount and mount the affected information stores.

    • Restart the Microsoft Exchange Information Store service.

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" (