oh, pretty useless then :/
Not really, I think it's the only free
option if you want to run an AV on Windows Home Server 2011.
I'm running it currently on WHS2011 but there is one very annoying 'feature' that will probably make me uninstall it: you have no say in what to do with any supposedly infected files - they will be deleted, disinfected or no action taken. Absolutely no user decision is asked for.
In fact, it has the most useless settings section of any free AV I've ever seen.
So, if you want something with a little more interaction, then almost any other free AV is probably better.