Download Windows Server Update Services (formerly WUS) Release Candidate
The Windows Server Update Services (WSUS) Open Evaluation Program (OEP) lets you evaluate the Release Candidate of WSUS in a non-production environment. This version is not supported and can be used in a test environment only. Download the release candidate by clicking the link below.
http://www.microsoft.com/windowsserversystem/updateservices/evaluation/trial/default.mspx#EFAA