Windows Server Update Service

Prerequisite

 * MS MMC 3.0
 * MS Report Viewer 2005
 * .NET 2.0 Redist

Downloading
You can download Version 3.0 from:
 * Windows Server 2003 - Standard
 * Windows Server 2003 - Small Business Server

WSUS Resources

 * USUS Main Page
 * WSUS Forums