Windows Update is a service by Microsoft that gives updates for the Microsoft Windows operating system and its installed components, as well as the Internet Explorer. An elective feature disables access to Windows Update, enabling instead access to Microsoft Update, an extended version of the service which gives updates not just for the operating system and Internet Explorer, but also for other Microsoft software running under Windows, such as Windows Live applications, Microsoft Office, and Microsoft Expression Studio. Updates are usually provided with the use of an Internet connection, but there is condition for updates to be installed on computers without an Internet connection. Different kinds of updates are the security updates or critical updates which protect against the danger of malware and security exploits; other updates repair errors that are not related to security, or improve functionality. In Windows Vista, there’s an update package file which has a source code to initialize system updates or upgrades, or fixes and patches for the Vista systems. These files are incorporated with the source data collection specifications owned by Microsoft Corporation, and are implemented with standards for the MSU format needed by other Microsoft Window-based systems.