Windows Server 2008 Build 6003 Apr 2026

winver Or:

| Scenario | Build Number | Support Status | |----------|--------------|----------------| | Server 2008 SP2 (unpatched since 2020) | 6002 | (vulnerable) | | Server 2008 SP2 with ESU (2020–2023) | 6003 | No longer receiving new updates (ESU ended Jan 2023) | | Server 2008 SP2 with paid ESU Year 4 (private agreement) | 6003 | Rare, but possible | windows server 2008 build 6003

OS Version: 6.0.6003 N/A Build 6003 No. The build number alone does not guarantee active security support. Here is the critical distinction: winver Or: | Scenario | Build Number |

systeminfo | findstr /B /C:"OS Name" /C:"OS Version" Expected output for a Build 6003 system: This article explains what Build 6003 represents, how

| Build Number | Version | Context | |--------------|---------|---------| | | RTM | Original release (Windows Vista/Server 2008 RTM) | | 6001 | SP1 | Service Pack 1 | | 6002 | SP2 | Service Pack 2 (most common base) | | 6003 | SP2 + ESU | Post-January 2020 updates (Extended Security Updates) |

If you have managed a Windows Server 2008 or 2008 R2 machine recently and run winver , you might have been surprised to see Version 6.0 (Build 6003) instead of the expected Build 6001, 6002, or 6003. This article explains what Build 6003 represents, how it differs from other builds, and what it means for your servers. The Short Answer Build 6003 is not a new version of Windows Server 2008. It is a build number revision introduced via a specific servicing update (KB4489887 for Server 2008 SP2). Its primary purpose is to distinguish systems that have received certain post-Extended Security Update (ESU) patches from those that have not. A Brief History of Windows Server 2008 Builds To understand Build 6003, let's look at the timeline: