Windows XP SP3 combines all previously released performance, security, and stability updates. It also provides a limited number of new and enhanced functionalities, although it does not significantly change the Windows XP experience or bring functionality from newer versions of Windows to Windows XP. The goals of Windows XP SP3 are to:
Provide a new baseline for customers still deploying Windows XP, to help them avoid the inconvenience of applying individual updates.
Fill gaps in the updates users might have missed by declining individual updates when using Automatic Updates, and to deliver updates not made available through Windows Update.