The former expands the core service to include other Microsoft products, such as Microsoft Office and Microsoft Expression Studio. Since its inception, Microsoft has introduced two extensions of the service: Microsoft Update and Windows Update for Business. The service delivers software updates for Windows, as well as the various Microsoft antivirus products, including Windows Defender and Microsoft Security Essentials. Microsoft Windows Update is a Microsoft service for the Windows 9x and Windows NT families of operating system, which automates downloading and installing Microsoft Windows software updates over the Internet.
