As organizations continued to use more computers, the per-machine Windows Update clients started to become unwieldy and insufficient. In response to the need of organizations for deploying updates to many machines, Microsoft introduced Software Update Services (SUS), which was later renamed Windows Server Update Services (WSUS). A component of the Windows Server family of operating systems, WSUS downloads updates for Microsoft products to a server computer on which it is running and redistributes them to the computers within the organization over a local area network (LAN). One of the benefits of this method is a reduction in the consumption of Internet bandwidth, equal to "(N-1)×S", where N is the number of computers in the organization and S is the size made by the updates. Additionally, WSUS permits administrators to test updates on a small group of test computers before deploying them to all systems, in order to ensure that business continuity is not disrupted because of the changes of the updates. For very large organizations, multiple WSUS servers can be chained together hierarchically. Only one server in this hierarchy downloads from the Internet.