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Tomorrow marks one month since opening statements began in the case Gordon v. Microsoft. In the late '90s the U.S. government and a number of states took on the software giant for anti-competitive practices. But Gordon v. Microsoft is the first private, class-action lawsuit against the company to actually go to trial.

The plaintiffs have just called one of their main expert witnesses. Stanford antitrust economist Roger Noll is expected to tell the jury how Microsoft overcharged up to one million Minnesota consumers by maintaining an illegal monopoly in software. The suit seeks damages of more than $400 million.

Tomorrow I'll talk with one of Microsoft's lawyers, but today we'll check in with the plaintiffs. Outside the Minneapolis courtroom, attorney Richard Hagstrom says his team is trying to keep the jury interested through weeks of evidence and testimony. (Jeff Horwich guest-hosts.)