After nearly 18 years, Microsoft has retired the Windows Vista/Server 2008 codebase (NT 6.0). While standard extended support ended in 2020 and general Extended Security Updates (ESU) wrapped up in 2024, a small group of organizations with Premium Assurance (PA)
The transition typically begins with KB4493471 , though other quality rollups like KB4489887 also trigger the version change. windows server 2008 build 6003 upd