Office XP Update: Service Pack 1 (SP-1) provides the latest updates to Microsoft Office XP. SP-1 contains significant security enhancements and stability and performance improvements. Some of the fixes included with SP-1 have been previously released as separate updates. Office XP Update: Service Pack 1 (SP-1) combines them into one integrated package, and it includes a number of other changes designed to improve the reliability and performance of your Office XP programs. This version is the first release on CNET Download.com.