As Silverlight is from Microsoft, and builds on a .NET environment, I suspect that it's only for IIS servers (Windows hosting plan). The Silverlight site seems to be a bit vague about that, but does promise that any browser will work with it. I have no idea if adding ASP.NET support to a Linux (Basic or Business plans) would be enough for you. Linux plans use the Apache server, not Microsoft's IIS. Have you carefully read over the Silverlight site? I took a quick look, but haven't studied it in depth.