"We're in a unique position (to sue Microsoft) because as a company we sell a product and we're not reliant on Microsoft for technology exchange." "It is our intention to finish the job the Justice Department left unfinished when it settled its antitrust complaint through consent decree," Susman said. Microsoft attorneys were reviewing Caldera's complaint on Wednesday. "We have not yet seen the complaint but based on the press release, this appears to be simply a rehash of tired old allegations that are completely without merit," Microsoft spokesman Mark Murray said. "It's ironic given all of the new competition and innovation that's going on in the software industry today that Caldera is filing a lawsuit about outdated technology that the market has long left behind," he added. Microsoft's basic operating system, called MS-DOS, became a standard on personal computers when IBM chose it to run its first PC back in 1980. MS-DOS is still a foundation in Microsoft's Windows operating programs.