Windows updating service
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.Critical 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". By 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.Windows XP and Windows 2000 SP3 include Background Intelligent Transfer Service, a Windows service for transferring files in the background without user interaction.
The service delivers software updates for Windows, as well as the various Microsoft antivirus products, including Windows Defender and Microsoft Security Essentials.
Once the check is executed, any custom schedule defined by the user is reverted to the default. Moore in early 1999 was critical of this approach, describing it as "horribly inefficient" and susceptible to attacks.
Microsoft stated that this ensures that users received notification of critical updates in a timely manner. In a posting to Bug Traq, he explained that, "every single Windows 98 computer that wishes to get an update has to rely on a single host for the security.
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.
The cause was an exponential algorithm in the evaluation of superseded updates which had grown large over the decade following the release of Windows XP.
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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.