Calling the demands of the nine states still pursuing their anti-trust case against Microsoft “technically impossible,” Bill Gates told U.S. District Judge Colleen Kollar-Kotelly today that the proposal to break-up the Windows operating system would set the OS back 10 years, according to Reuters. “The (states’ ideas) would undermine all three elements of Microsoft’s success, causing great damage to Microsoft, other companies that build upon Microsoft’s products, and the businesses and consumers that use PC software,” Gates said as part of his 155-page written submission. Gates took the stand Monday for the first time since the anti-trust case began four years ago. Gates’ full testimony can be read here.