Re: Free stuff
While I agree that open source is only free if time is free, the story is about open source being _cheaper_, not being free. I can easily see how it would be cheaper.
Firstly, there's an open market for supporting software like Linux because it doesn't come from a single source. You can shop around to find the best support deal for your organisation.
Secondly, most system support in most organisations is provided internally by a department hired and trained for whatever software stack happens to be in use. It's relatively rare that you kick a problem back to the supplier and very unlikely if they're going to restrict what they use to the big name projects that have seen wide deployment, like the Apaches, OpenOffices, etc of the world. So in-houe support costs probably remain the same.
That all being considered, you hopefully end up spending slightly less on support in total and nothing whatsoever on licences.
On the assumption that someone reasonably intelligent has set up the computers and locked them down in the same way that most corporate machines are locked down (so, e.g. for a desk staffer it'd boot up to a GUI desktop with a browser, a Word-like word processor, etc, and all customisation and package management would be disabled) I also don't imagine you're looking at any real extra training costs and in any case training costs are a one off. You'd budget for maybe a month of slowed productivity as a switchover cost, which probably would pay for itself within a year.