What you've just said is the main set of reasons the consultancy's clients have more Windows systems than Linux systems between them. In fact, Windows probably makes up 60% to 65% of the systems we support at client sites.
That's not to say that Linux can't do all the same jobs, or even that Linux can't do them as well or better, and without any additional aggravation for the end users, in many cases. It's just the case that a lot of the time circumstance favors Windows, not because Windows is better, but because of matters of migration costs and compatibility with other businesses.
On the other hand, Linux use is growing amongst our clients. It's a slow process, but it appears to be irreversible.
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