The title of this article suggests he switched all the computers over to Ubuntu when really he just installed it on the RAID server. This seems like it would be very common for small networks.

Personally, I have a UNIX box running file and printer sharing for a few windows computers. No one would ever know I didn't run windows on the server unless I told them. No one who works in the office is going to know he is using Linux or care, they will see XP on their desktops and life goes on. IMO the only way this "story" would come close to qualifying as a story is if his workstations all ran Ubuntu.