Operation
Windows Server Update Services 2.0 and above comprise a repository of update packages from Microsoft. It allows administrators to approve or decline updates before release, to force updates to install by a given date, and to obtain extensive reports on what updates each machine requires. System administrators can also configure WSUS to approve certain classes of updates automatically (critical updates, security updates, service packs, drivers, etc.). One can also approve updates for "detection" only, allowing an administrator to see what machines will require a given update without also installing that update.
Administrators can use WSUS with Group Policy for client-side configuration of the Automatic Updates client, ensuring that end-users can't disable or circumvent corporate update policies. WSUS does not require the use of Active Directory; client configuration can also be applied by local group policy or by modifying the Windows registry.
WSUS uses .NET Framework, Microsoft Management Console and Internet Information Services. WSUS 3.0 uses either SQL Server Express or Windows Internal Database as its database engine. WSUS 2.0 used MSDE. System Center Configuration Manager (SCCM) interoperates with WSUS, and is able to import third party security updates into the product.
Read more about this topic: Windows Server Update Services
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