The judge in Calderas' three-year-old anti-trust lawsuit against Microsoft last week ruled against the company on four of its nine motions to have the case decided without a trial.

Microsoft filed a request for summary judgment in February. It contended there was no evidence to support several of Caldera's claims, including allegations that Microsoft illegally tied Windows 95 to the MS-DOS operating system, and that Microsoft created artificial incompatibilities between Windows and Caldera's version of DOS.

But, US District Court Judge Dee Benson said Caldera has presented enough evidence for these and other questions to be answered in court. In June, Benson ruled against Microsoft on a motion to narrow the case. The trial is scheduled to start January 17.