While you cannot officially download a fresh copy of the full OS directly from the modern Microsoft Store, some retired components and specific virtual machine (VHD) files remain available on the Official Microsoft Download Center Windows Server 2003 | Specs, reviews and EoL info - InvGate
Instead:
Because Microsoft no longer provides these images, you should be extremely cautious of third-party download links, as they often host unauthorized or compromised software. windows server 2003 iso download
⚠️ Running a Windows Server 2003 instance in a production environment poses extreme operational risks. Consider the following before deployment: While you cannot officially download a fresh copy