Error When Users Try to Open a AD RMS Protected Document using Office 2003

Symptoms: Starting on December 11, 2009, customers who use Office 2003 will be unable to open Office 2003 documents that are protected with the Active Directory Rights Management Service (AD RMS) or with Rights Management Services (RMS). Customers will also be unable to save Office 2003 documents that are protected with AD RMS/RMS.

Error: "Unexpected error occurred. Please try again later or contact your system administrator"

Scope: This symptom affects Office 2003 products that are used together with AD RMS/RMS. This includes Word 2003, Excel 2003, PowerPoint 2003, and Outlook 2003. This does not affect the 2007 Microsoft Office system.

See:
http://support.microsoft.com/kb/978551/en-us
Hotfix:
http://www.microsoft.com/downloads/details.aspx?FamilyId=A027462D-3399-48C0-9F20-4E296703D89E&displaylang=en