6003: Windows Server 2008 Build

Without an active ESU license, attempting to install post-6003 updates will fail.

Backup and disaster recovery

Build 6003 exists because of Microsoft’s Extended Security Update (ESU) program and custom support agreements for enterprise clients. As security vulnerabilities emerged well past the official End of Life (EOL) date, Microsoft had to modify core kernel components to patch deep-seated flaws. windows server 2008 build 6003