How Is Ubuntu Doing as a Server Platform?

Canonical jumped into the Unix distribution business in October 2004 and got into Linux server distribution in June 2006. With the launch last week of Ubuntu 7.10 for desktops and servers last week and the upcoming launch in April 2008 of a new Long Term Support variant of Ubuntu, it is reasonable to stop for a second and try to assess how well or poorly Ubuntu is doing on servers.

One of the first problems in trying to figure out how Ubuntu is doing on servers is that Canonical and the Ubuntu project that it controls has no concrete numbers on how many Ubuntu distributions are out there in use.