With its landmark antitrust case set for another round of hearings, some rivals fear the proposed Justice Dept. settlement won't constrain the software giantPALM (PALM

) contends it has been denied technical information needed to develop software and make its devices function smoothly with Windows. That could give an edge to handhelds using Microsoft's software.SONY (SNE

) argues that Microsoft (MSFT

) is using its settlement with the Justice Dept. as leverage against PC makers, forcing them to accept unfavorable licensing deals.SBC (SBC

) charges that Microsoft will leverage its operating-system monopoly to dominate phone service on the Net.