Use of Windows Home Server as a desktop OS is not supported and (of course) not recommended. Windows Server 2003 in general doesn't make a very "nice" desktop OS, and the tweaks to allow Windows Home Server to work make it much less friendly.
In addition, Windows Home Server is not configured by default to allow incoming remote desktop connections to the server from outside the local area network.
In ither words, wait until you can get it and install Windows 7 for Mom and Pop.
I'm not on the WHS team, I just post a lot. :)