WindowsUpdateClient

WindowsUpdateClient is the client component of the Windows Update Agent API used by Windows to manage software updates. It coordinates the search, download, and installation of updates from Microsoft Update servers, Windows Server Update Services (WSUS), or other update sources configured by policy. The Windows Update Client runs in conjunction with the Windows Update service (wuauserv) and is exposed to application code through COM interfaces, enabling software to programmatically perform update operations.

The core capabilities typically exposed include initiating an update session, querying for updates via an update searcher, downloading selected updates, and installing them using an installer component. Administrators can configure behavior via Group Policy or mobile device management (MDM), affecting timing, installation options, and user prompts. WindowsUpdateClient is part of the built-in Windows Update infrastructure introduced in modern Windows versions to support centralized and automated servicing, while receiving updates as part of Windows system servicing.

In enterprise environments, WSUS or other management solutions can funnel updates through WindowsUpdateClient on managed devices, aligning with organizational update policies. The component is designed to operate with appropriate privileges and to work transparently in the background, ensuring devices receive required security and quality updates while maintaining user productivity.