TCO is one of those obscure buzzterms, “Total Cost of Ownership,” that everyone seems to use, everyone claims to understand. But I suspect, the term has falled into public and very loose usage, despite its several trademarks. A new study in ZDNet Tech Update suggests that, while Linux admins may cost a little bit more upfront, the long-term cost of supporting a large number of servers is cheaper with Linux than Windows or Solaris. Interesting reading.