Hello,
I can see this is an old thread, but I am gonna post my story too, for the record.
I use an old Lenovo ThinkPad T60 as personal home server (OpenVPN, LAMP, IRC, Mumble, etc).
It runs Ubuntu 10.04 64bit (desktop edition!) and it works very nice.
I have 15+ days of uptime on a regular basis, the only reasons for reboots are: kernel upgrades and electricity failures.