Office 2003 SP3 has been reliable on all home and work PCs, as it installed as soon as it became available one year ago. Anyone on SP2 or earlier releases should update their systems to the latest version for improved security and to remain on active support.
QUOTE: Microsoft® Office 2003 Service Pack 3 (SP3) represents a major evolution in security for Office 2003. It further hardens the Office suite against potential attacks and other security threats. This service pack also includes fixes that have been previously released as separate updates for Office 2003.