You can't use browser-hosted WPF apps as they require the .Net 3.0 runtime on the client. Once WPF/E is ready though, that may change.

I'm also not sure if CardSpace requires anything on the client. If you're wanting to use that, check into it more.

>Hi,
>
>This is probably a stupid question, but I'm a little confused.
>
>.Net 3.0 is not compatible with Windows 2000.
>
>If I create a web application with .Net 3.0 and install it on Windows 2003 Server, can it still be used by a client running Windows 2000 and Internet Explorer 6?
>
>I'm assuming that the answer is YES and that only desktop applications developed with .Net 3.0 would be a problem in Windows 2000, but I can't find anything on the internet to confirm that.
>
>Matt.