Dell has been accused of withholding evidence, including e-mails among its top executives, in a lawsuit over faulty computers it sold to businesses, according to a filing made Thursday. Advanced Internet Technologies filed a motion in U.S. District Court in North Carolina asserting that Dell had deliberately violated a court order by failing to produce documents written by its executives, including the company's chief executive and founder, Michael S. Dell. The filing is the latest twist in a three-year-old lawsuit brought by AIT that accuses Dell of selling at least 11.8 million faulty PCs over three years and then trying to hide problems with the computers from customers. AIT, an Internet services company, says it lost business as a result of the broken Dell machines. Dell disputes the accusation. 'We disagree with AIT's contention that we violated the discovery order and will be filing our response with the court soon,' said David Frink, a spokesman at Dell. 'We take all court orders and our obligations to comply with them very seriously.' AIT declined to comment. Documents already been made public in AIT's lawsuit showed Dell grappling with faulty parts in the PCs and trying to isolate the problems they had caused. But in its filing, AIT asserted that Dell had provided only a snippet of the communications among top executives about the faulty computer problems. In its filing, AIT argued that Dell must have had more high-level communications than a 'talking points' memorandum sent to Dell and Kevin Rollins, then the chief executive, because of the severity of the problem. Some of the company's largest customers were affected by the problem, and Dell had to take a $300 million charge related to the replacement of the bad computers. Larry E. Daniel, a digital forensics expert, has filed an affidavit in the case, stating that the handful of messages Dell provided appeared altered and incomplete. Daniel suggested that Dell should provide access to the underlying e-mail files rather than cutting and pasting text. In its most recent filing, AIT produced communications that showed Dell's management discussing how to frame the PC problems for investors, the media and customers. Dell and Rollins were informed by the vice president for investor relations, Lynn Tyson, in an August 2005 e-mail that Dell would 'continue our reactive posture with the media' about the PC situation. She told the executives that the public would hear that 'the problem poses no risk of safety or data loss for our customers,' that 'we have been working with our customers to resolve problems in the most effective manner possible' and that 'we're committed to fixing any systems that fail.' 