kidding right? HP with windows home server? windows home server 2011 got rid of drive extender (why most home users even got the OS), and other features.
Drive Extender removal
On 23 November 2010, Microsoft announced that Drive Extender would be removed from Windows Home Server 2011.[13] This announcement has led to "astonishment and outrage" from testers and users.[14] Criticism of Drive Extender's removal is mainly related to it being seen as a core feature of Windows Home Server and a key reason for adoption. Windows Home Server 2011 developer Michael Leworthy expressed concern that the implementation of Drive Extender might lead to "data error issues.â€[15]
HPs have crappy hardware and mobos that go south easy.
they are the lowest end PC and even HP spun off thier PC division. they don't even like thier consumer business end it's that bad.
best to build thier own server or
If they want a pre-built server and don't want to build thier own....
I recommend getting a cheaper dell poweredge server off ebay (1 or 2 socket 4 core xeons and 6-12GB of RAM can be had for as little as 350-550 but one issue they have loud PSUs and aren't the best looking) and 90% of that is stock from co-location datacenters, so those servers are in good shape and some even come with racks!!!!
dell poweredge server | eBay
there are a few that even come with MS SBS licenses!!!!