Wsus not updating
As the number of updates offered by Windows Update grew, this resulted in performance concerns.
Arie Slob, writing for the newsletter in March 2003, noted that the size of the update list had exceeded 400KB, which caused delays of more than a minute for dial-up users.
WSUS builds on SUS by expanding the range of software it can update.
The WSUS infrastructure allows automatic downloads of updates, hotfixes, service packs, device drivers and feature packs to clients in an organization from a central server(s).
While details have changed from version to version, it has always scanned the computer to find what operating system components and software are installed, and compared the versions of those components with the latest available versions.
The Active X component then executes the downloaded installation files in their silent/unattended mode to install or update those components, and to report the success or failure of those installations back to Microsoft's servers.
One can also approve updates for "detection" only, allowing an administrator to see which machines will require a given update without also installing that update.Windows Update was introduced as an Internet web site with the launch of Windows 95.A link to Windows Update on the Start Menu gave access to additional downloads for the operating system.The first version of the Windows Update web site (usually referred to as "v3") did not require any personally-identifiable information to be sent to Microsoft.In order for the v3 Active X control to determine what updates were needed, the entire list of available software on Windows Update was downloaded to the user's computer when they visited the Windows Update web site.