An anonymous reader writes: One of Australia's largest government technology buyers, the Tasmanian Department of Education, has gone to market for a security vendor to supply anti-virus software for its 40,000-odd desktop PCs and laptops, as well as servers. But the department's not just running Windows — it runs Mac OS X and Linux as well, and has requested that whatever solution it buys must be able to run on those platforms as well. But have we reached the stage were Mac OS X and Linux even need third-party security software? It seems like most Mac and Linux users don't run it. Thoughts?