I just took a look at the MSDN web site. The fle you downloaded is "Windows Server 2003 Service Pack 2 (x86) - CD (English)" which only contains the SP2 update files. What you need to look for is a file named e.g. en_windows_server_2003_with_sp1_standard.iso "Windows Server 2003 Standard Edition with SP1 (English)".
It was meant for building and hosting web pages. Web applications and web services including XML were also added. Basically, Microsoft was trying to create a platform for ASP.NET innovations. The web edition was primarily used as an IIS web server. Unfortunately, the domain controller and terminal service features are no available for the web edition. Basically, we can say that this is the basic version of Windows Server 2003 with low cost and highly focused on Web servings. 2b1af7f3a8