Why insist on SP2? Because a pre-SP2 Windows Server 2003 RTM or R2 lacks:
Running Windows Server 2003 R2 Enterprise SP2 in 2026 on a production network is . Here is why: windows server 2003 r2 enterprise sp2 -32 64 bit- iso
It is essential to consider these factors before deciding to use Windows Server 2003 R2 Enterprise SP2 in your environment. You may want to explore upgrading to a newer, supported version of Windows Server to ensure you receive security updates and technical support. Why insist on SP2