Windows Web Server Edition 2008 SP2 x64

  http://www.microsoft.com/windowsserver2008/en/us/2008-web.aspx

 
      Designed to be used specifically as a single-purpose Internet-facing Web server, 
      Windows Web Server 2008 delivers on a rock solid foundation of Web infrastructure 
      capabilities in the next-generation Windows Server 2008. Integrated with the newly 
      re-architected IIS 7.0, ASP.NET, and the Microsoft .NET Framework, Windows Web Server 
      2008 enables any organization to rapidly deploy Web pages, Web sites, Web applications, 
      and Web services.