AT&T has revealed that it filed a lawsuit against Microsoft last autumn, accusing it of withholding vital NT sourcecode.
The telephone giant claims that Microsoft violated a 1991 contract by not providing the sourcecode, which AT&T licenses in order to develop Advanced Server for Unix, which allows NT and Unix applications to run on the same platform.
AT&T argues that Microsoft has refused to share sourcecode for the forthcoming NT 5.0 release, with the aim of pressurising Unix users to switch to NT.
Microsoft denies the charges, which have never been made public until this week. A spokesperson said: "We have fully complied with our contract and it is apparent that AT&T is trying to rewrite the contract years later."
The case is likely to come to court in September, around the same time that Microsoft faces the judges over antitrust actions brought by the US Department of Justice and 20 US states.
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