Microsoft have discontinued WHS 2011 http://www.pcadvisor.co.uk/news/software/3368454/say-goodbye-windows-home-server/
There will be a replacement, but it is expensive at $425 for a 25 user licence Windows Server 2012 beta can be downloaded Here (http://www.microsoft.com/en-us/download/details.aspx?id=30327) it's a 4.6Gb download in total.
Sad but I guess technology moves on, sometimes.
Good thing the penguin's still shuffling about