Windows Server 2008 Build 6003 Upd May 2026

Most users required no action, but legacy scripts or third-party monitoring tools hardcoded to look for the "6002" version string required manual updates.

During the ESU period, Microsoft continued releasing monthly security rollups. In (pre-ESU, as a preview), one specific update—KB4489887 (for Windows Server 2008 SP2)—unexpectedly incremented the kernel build number from 6002 to 6003 . windows server 2008 build 6003 upd