Sami at F-Secure has been in touch to say that there is a beta available for F-Secure for Windows Home Server. Its free and is public so anyone can go and download the software and try it.
F-Secure® Home Server Security protects Windows Home Server against malicious content, such as viruses, worms, Trojans, spyware and riskware. With F-Secure Home Server Security, you can guard your digital pictures, archives and other valuable data stored on the central server against content threats. When F-Secure Home Server Security is installed to your Windows Home Server, you do not have to worry about distributing hostile content to other computers in your home network or the Internet.
You can register for the beta here : http://support.f-secure.com/beta/fshssb/fshssb.shtml
I’ve just registered and will be installing and testing this later so will post more soon.