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practices that discouraged the installation of non-Microsoft operating systems. Microsoft once assessed license fees based on the number of computers an OEM sold, regardless of whether a Windows license was included. Beginning in 1983, Microsoft sold MS-DOS licenses to OEMs on an individually negotiated basis. The contracts required OEMs to purchase a number of MS-DOS licenses equal to or greater than the number of computers sold, with the result of zero marginal cost for OEMs to include MS-DOS. Installing

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