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Linux market share passes 4% for first time
(arstechnica.com)
This is a most excellent place for technology news and articles.
No doubt it's the most widely run OS, I think the significance is akin to the difference between ios and android. Android dominates smart phones as a whole but ios still generates far more revenue, giving them arguably more power. So while linux is more widely used, microsoft still dictates computing for the majority of people.