This service pack also includes updates previously released for Office 2003 MultilingualUser Interface Pack: This service pack includes significant new security updates.
You can get specific information about this update in the Microsoft Knowledge Base article (923618): Description of Office 2003 Service Pack 3. This service pack also includes fixes that have been previously released as separate updates for Office 2003 Multilingual User Interface Pack.
It further hardens the Office suite against potential attacks and other security threats. Microsoft® Office 2003 Service Pack 3 (SP3) for Multilingual User Interface Pack represents a major evolution in security for Microsoft Office 2003. Office 2003 Service Pack 3 for Multilingual User Interface Pack provides the latest updates to Office 2003 Multilingual User Interface Pack. Office 2003 Service Pack 3 (SP3) for Multilingual User Interface Pack
