Outlook Web Access for Exchange Server 2003 introduces content filtering known as "Safe HTML" filtering to help protect users from malicious script and from certain HTML elements. For more information on “Safe HTML� filtering, see KB 899394 - How to share files that are removed by the "Safe HTML" filtering feature in Outlook Web Access for Exchange Server 2003.

The "Safe HTML" features in Outlook Web Access for Exchange Server 2003 affect content in e-mail messages or attachments which use the POST method. This update allows workflow application code to use the HTML POST method within e-mail forms or attachments if the action URI meets the requirements specified in KB 912939.
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Exchange 2003, Update to support workflow, OWA