There are only TWO – Red Hat (which essentially includes Centos) and Suse. Ubuntu is an also-ran that has a long way to go. Mandriva is a third possible since they actually have a server program with support, but they are still FAR behind Red Hat and Suse.

Everything else is either a community distro or a “one-man band” and is irrelevant to business.

A COMMERCIAL Linux distro offers paid support AND offers a kernel and software optimized for server use. That is the ONLY distinction between distros which is of significance to business.

Driver vendors? These clowns aren’t going to support Linux until the big retailers like Dell and HP and Lenovo force them to. And that won’t happen until corporations wake up and try to get out from under Microsoft’s problems and then start demanding their hardware vendors support Linux.