Usage share of operating systems Usage share of operating systems The usage share of operating systems is the percentage of computing devices that run each operating system at any particular time. All such figures are necessarily estimates because data about operating system share is difficult to obtain; there are few reliable primary sources—and no agreed methodologies for its collection. In the personal computing platform area of smartphones and watches two systems dominate: Google's Android with over 2.7 billion users and Apple's iOS and macOS combined with over 1.3 billion users. In the area of desktop and laptop computers, Microsoft Windows is generally above 75% in
Market share liability mostly rejected because the strict requirements of applying market share liability. Courts have declined to expand the market-share approach to asbestos ("Becker v. Baron Bros."), handguns ("Hamilton v. Beretta"), and lead paint ("Santiago v. Sherwin Williams Co."). The market-share approach has been expanded to cases involving MTBE in the New York case "In re Methyl Tertiary Butyl Ether". Market share liability Market share liability is a legal doctrine that allows a plaintiff to establish a prima facie case against a group of product manufacturers for an injury caused by a product, even when the plaintiff does not know from which