From the data-is-not-the-plural-of-anecdote department: My sister co-founded and works full time at a small non-profit retail business with an extremely limite

From the data-is-not-the-plural-of-anecdote department: My sister co-founded and works full time at a small non-profit retail business with an extremely limited budget. Faced with a slowly-dying ancient Win98 laptop as her only computer and doing all the business's finances on paper, a few months ago I donated a slightly less ancient Dell laptop and a second-hand desktop box, after installing Ubuntu on both (the desktop also included a minimalist PoS system that I wrote over a few weekends, plus stuff like GNUCash already installed). Talking to her since then, both machines seem to be giving her far fewer headaches than the Windows 98 box did, and despite me fishing for any complaints she seems perfectly happy with Ubuntu. For context, her level of technical sophistication is around the level of "knows the difference between hard drives and RAM, and writes HTML by hand (using table layouts)", so better than the average guy off the street but nowhere near stereotypical bearded Linux users (such as, um, myself). So, what makes Linux work for her? 1) Support from a family member, though apparently so far everything just works 2) No requirements to use Windows-only software or unusual hardware 3) Extremely limited financial resources, combined with not using the typical means that reduce Windows' TCO to match Linux (bulk/academic discounts, hiding the cost in the price of new hardware, getting pirated copies, etc.). These three factors are certainly not unique, but the combination is somewhat unusual, and I doubt any amount of aggressive word-of-mouth marketing from Linux geeks is going to get people using it without those factors.