Microsoft does not support using ISAPI extensions or filters
to modify Microsoft Office Outlook Web Access credentials on a server that is
running Microsoft Exchange Server.
scenario is not supported because of the adverse effect it can have on Outlook Web Access
functionality. Additionally, there are no guidelines about how to correctly build
an ISAPI filter that would change Outlook Web Access credentials.
Single sign-on applications may use an ISAPI extension on
the server that is running Exchange Server to modify credentials that are being
passed to Outlook Web Access. We do not support this kind of manipulation in
any version of Outlook Web Access. This includes Microsoft Outlook Web Access
2000, Microsoft Office Outlook Web Access 2003, and Microsoft Office Outlook
Web Access 2007.
We do not support any scenario in which an
application that is positioned in front of Outlook Web Access changes the data
stream on which Outlook Web Access relies.
This kind of procedure may
have worked in earlier versions of Exchange Server. However, it is less likely
to work in Microsoft Exchange Server 2007. If you are experiencing a problem
with such an application, contact the software provider.
For more information, visit the following Web site: