[2] 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.

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.

System Center Configuration Manager (SCCM) interoperates with WSUS and can import third party security updates into the product.

The fact that user workstations authenticate themselves to the WSUS service to retrieve their updates makes it necessary to acquire a fileserver client access license (CAL) for each workstation connecting to the WSUS service.

WSUS is often considered as a free product because fileserver CAL are already paid for in an enterprise network that has a Microsoft Active Directory and thus do not need to be acquired again.