Topic Last Modified: 2005-12-15

The Microsoft® Exchange Server Analyzer Tool reads the following registry entries to determine the language settings that are used by Microsoft Outlook® Web Access clients:

The level of the browser determines message encoding if the following conditions are true:

An uplevel browser, Internet Explorer 5 or a later version, sends messages in UTF-8. An earlier browser, or one other than Internet Explorer 5, sends messages in the appropriate encoding for that browser's acceptance language.

The UseAltRegionalCharset key only changes the behavior for browsers configured for the languages in the following list:

If the UseAltRegionalCharset key is set to 1, both uplevel and earlier browsers send messages in the following encodings:

The Exchange Server Analyzer also queries the Active Directory® directory service to determine the value of the serialNumber attribute for all objects that have an object class of msExchExchangeServer.

The Exchange Server Analyzer displays a warning if the following conditions are true:

For Exchange 2000 Server and Exchange Server 2003, the alternative character sets take precedence when the following conditions are true:

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 issue
  1. On the Exchange computer, open a registry editor such as Regedit.exe or RegEdt32.exe.

  2. Determine which Outlook Web Access language settings are appropriate for the Exchange Server environment and remove the key that is not appropriate.

    1. Navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeWEB\OWA\

    2. Select the key to be removed, right-click the key, and then select Delete from the drop down list.

  3. Close the registry editor.

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

For more information about Outlook Web Access language settings, see the following Exchange Server resources:

The "Exchange Server Client Access Guide" (

Microsoft Knowledge Base article 311342, "XCCC: Exchange 2000 Server SP2 Server-Side OWA Registry Keys" (