The judge in the US government's antitrust case against Microsoft has ruled that two attempts to appeal the case, including one from a consumer group, cannot move forward.

District Judge Colleen Kollar-Kotelly has denied two motions to intervene for purposes of appeal, one from Consumers for Computing Choice (CCC), and the other from Robert Litan, vice president and director of the Economic Studies Program at the Brookings Institution, a liberal Washington think tank.

CCC filed the motion in December arguing that the proposed settlement between Microsoft, the Department of Justice and several states would harm consumers. CCC had argued that the settlement didn't go far enough in opening Microsoft source code to outside developers.

Kollar-Kotelly ruled that CCC does not have enough of a "personal stake" in the outcome of the case to warrant an appeal. A "generalized grievance shared in substantially equal measure by all or a large class of citizens", is not enough of a legal standing to appeal a federal antitrust case, she wrote.

CCC also "failed to demonstrate that its interests were not adequately represented by the parties", the judge added. The judge used the same arguments in denying Litan his chance to appeal.