In January 1969, the U.S. government begins an antitrust investigation into IBM's dominance and attempts to break up the company. At the time, IBM holds a 65% share of the computer market. As the 13 year investigation continues, the computer market sees a dramatic shift from mainframes to PCs, and with it IBM's market share. The case is dropped in 1982 as PC clones erode Big Blue's dominance.

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