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* An IBM witness continued his assault on Microsoft Corp. at the company’s antitrust trial Tuesday, alleging that Microsoft offered IBM discounts on its Windows software if IBM would agree not to distribute the rival Netscape Internet browser. The executive, Garry Norris, said that a Microsoft official warned him at a March 1997 meeting: “No Netscape.” Microsoft got a chance to return the fire when a Microsoft attorney attempted to cast doubt on Norris’ contention that in 1994 Microsoft tried to strong-arm IBM to stop distributing software that is a rival to Windows.