Windows Server 2003 Summary: It has the feature of Internet Information Services (IIS) v6.0 and include Significant improvements to Message Queuing. The Windows Server Manage Your Server a role management administrative tool that allows an administrator to choose what functionality the server should provide.
Use 2003 at your own risk. End of life this month, etc.
From Microsoft:
Windows Server 2003 SP2 (32-bit x86) is a cumulative service pack that includes the latest updates and provides enhancements to security and stability. In addition, it adds new features and updates to existing Windows Server 2003 features and utilities.
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Windows 2003 Enterprise Iso Download
From Microsoft:
Windows Server 2003 SP2 (32-bit x86) is a cumulative service pack that includes the latest updates and provides enhancements to security and stability. In addition, it adds new features and updates to existing Windows Server 2003 features and utilities.