This requires exporting patch data from a WSUS server connected to the internet and, using removable media, importing to a WSUS server set up on the disconnected network. WSUS may be used to update computers on a disconnected network. 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. System administrators can also configure WSUS to approve certain classes of updates automatically (critical updates, security updates, service packs, drivers, etc.). It allows administrators to approve or decline updates before release, to force updates to install by a given date, and to produce extensive reports on which updates each machine requires. Windows Server Update Services 2.0 and above operate on a repository of update packages from Microsoft. 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 or servers.
WSUS builds on SUS by expanding the range of software it can update. Support for SUS by Microsoft was originally planned to end on 6 December 2006, but based on user feedback, the date was extended to 10 July 2007. Clients could then download updates from this internal server, rather than connecting directly to Windows Update. SUS ran on a Windows Server operating system and downloaded updates for the specified versions of Windows from the remote Windows Update site which is operated by Microsoft. At first, it only delivered hotfixes and patches for Microsoft operating systems. The first version of WSUS was known as Software Update Services (SUS).
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