Service packs are maintenance updates to an operating system that contains minor enhancements and bug fixes. In which product updates are distributed. Service packs may contain updates for system reliability, program compatibility, security, and more. All of these updates are conveniently bundled for easy downloading. Depending upon the operating system version you were installed, you mayor may not need to apply a service pack immediately after installing the operating system. The window server' 2003 automatically check for updates before it install the operating system, so you should not normally have to install a service pack after running setup.