IIS load balancing

I intend to load balance two Web servers, using Cisco Content switch fabric. Thus the cluster/load balanced platform is provided by the Network layer, rather than MS W2K Advanced OS. The two servers will have W2K Standard edition OS loaded.
My question is that to cluster/load balance applications that are cluster aware is fine, but can I cluster/load balance IIS on this platform, without the need for W2K Advanced? Since it is an application, I would expect the answer to be yes, but since it’s an MS application that comes bundled with the OS, have they made it so that you need to buy W2K Advanced Server?