Got two XPenology's now. Just installed DSM 5.0-4493 Update 2 as per above site (xpenology.nl) on an old Laptop to see if it will run. And, to my suprise, it does. Pretty good too.
Only thing not working is the WiFi adapter. My purpose for the laptop is to use it as my NAS on holiday, so I can stow some movies on it for me and my kids with their tablets, use it as a storage for my camera and as an access point/dhcp for a local LAN while away and maybe in the car.