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The tool then compares this list with the list of installed updates on its machine and displays an update availability notification. The tool queries the Microsoft server for a file called ' cucif.cab', which contained a list of all the critical updates released for the operating system.

It was released shortly after Windows 98.īy default, this check occurs every five minutes, plus when Internet Explorer starts however, the user could configure the next check to occur only at certain times of the day or on certain days of the week. Screenshot of the Critical Update Notification dialog box in Windows 98.Ĭritical Update Notification Utility (initially Critical Update Notification Tool) is a background process that checks the Windows Update web site on a regular schedule for new updates that have been marked as 'Critical'. This version of the app makes an inventory of the system's hardware and Microsoft software and sends them to the service, thus offloading the processing burden to Microsoft servers. Windows Update v4, released in 2001 in conjunction with Windows XP, changed this. Arie Slob, writing for the newsletter in March 2003, noted that the size of the update list had exceeded 400 KB, which caused delays of more than a minute for dial-up users. But the list grew so large that the performance impact of processing became a concern.

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Instead, the app downloads a full list of every available update and chooses which one to download and install. The first version of the web app, version 3, does not send any personally-identifiable information to Microsoft. The Windows Update web app requires either Internet Explorer or a third-party web browser that supports the ActiveX technology. Microsoft attributed the sales success of Windows 98 in part to Windows Update. Fixes to Windows 98 to resolve the Year 2000 problem were distributed using Windows Update in December 1998. Security fixes for Outlook Express, Internet Explorer and other programs appeared later, as did access to beta versions of upcoming Microsoft software, e.g. The initial focus of Windows Update was free add-ons and new technologies for Windows. Windows 95 and Windows NT 4.0 were retroactively given the ability to access the Windows Update website and download updates designed for those operating systems, starting with the release of Internet Explorer 4.

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Windows Update was introduced as a web app with the launch of Windows 98 and offered additional desktop themes, games, device driver updates, and optional components such as NetMeeting. The Windows Update web app, version 4, in Windows Me In Windows 10 and Windows 11, the use of Windows Update is mandatory, however, the software agreement states that users may stop receiving updates on their device by disconnecting their device from the Internet.

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System administrators can configure Windows Update to install critical updates for Microsoft Windows automatically, so long as the computer has an Internet connection.

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Microsoft routinely releases updates on the second Tuesday of each month (known as the Patch Tuesday), but can provide them whenever a new update is urgently required to prevent a newly discovered or prevalent exploit. Cumulative updates were introduced with Windows 10 and have been backported to Windows 7 and Windows 8.1.

Cumulative updates are updates that bundle multiple updates, both new and previously released updates. Security updates or critical updates mitigate vulnerabilities against security exploits against Microsoft Windows. The service provides several kinds of updates. Starting with Windows Vista, the primary client component became Windows Update Agent, an integral component of the operating system. For a decade, the primary client component of the service was the Windows Update web app that could only be run on Internet Explorer. The latter is available to business editions of Windows 10 and permits postponing updates or receiving updates only after they have undergone rigorous testing.Īs the service has evolved over the years, so has its client software. 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. 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.