Windows updating software for use with the website

For a decade, the primary client component of the service was the Windows Update web app that could only be run inside Internet Explorer.

Starting with Windows Vista, the primary client component became Windows Update Agent, an integral component of the operating system. Security updates or critical updates mitigate vulnerabilities against security exploits against Microsoft Windows.

The tool queries the Microsoft server for a file called "", which contained a list of all the critical updates released for the operating system.

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.

The service delivers software updates for Windows, as well as the various Microsoft antivirus products, including Windows Defender and Microsoft Security Essentials.

But the list grew so large that the performance impact of processing became a concern.

Arie Slob, writing for the newsletter in March 2003, noted that the size of the update list had exceeded Windows Update v4, released in 2001 in conjunction with Windows XP, changed this.

Since its inception, Microsoft has introduced two extensions of the service: Microsoft Update and Windows Update for Business.

The former expands the core service to include other Microsoft products, such as Microsoft Office and Microsoft Expression Studio.Windows 95 and Windows NT 4 were retroactively given the ability to access the Windows Update website, and download updates designed for those operating systems, starting with the release of versions of Internet Explorer 4.The initial focus of Windows Update was free add-ons and new technologies for Windows.Windows XP and Windows 2000 SP3 include Background Intelligent Transfer Service, a Windows service for transferring files in the background without user interaction.As a system component, it is capable of monitoring the user's Internet usage, and throttling its own bandwidth usage in order to prioritize user-initiated activities.According to Woody Leonhart of Info World, early reports of this issue could be seen in Microsoft Tech Net forums in late May 2013, although Microsoft first received large number of complaints about this issue in September 2013.

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