As with the other software it produces, Apple frequently updates Mac OS X to improve security and reliability, fix bugs, add minor features, and so on. After you have installed and configured Mac OS X version 10.3, you should immediately check for and install updates to the OS and Apple applications that have been released since the version you installed. When you first start up under Mac OS X version 10.3, Software Update launches automatically. If it doesn't for some reason, or if you want to launch it manually, open the System Preferences application and click the Software Update icon to open the Software Update pane. In either case, use the Software Update tool to perform the update.
To learn how to use Software Update to update your software, see "Using Software Update to Maintain Your Software," p. 874.