Nearly 15 years ago, Sullivan & Cromwell’s David Tulchin signed on to defend Microsoft Corporation against an avalanche of claims that it stifled competition to promote an illegal monopoly for Windows. Now the last of the cases has finally reached a dead end at the U.S. Supreme Court, capping a tumultuous battle with Novell Inc.

In an order issued Monday, the Supreme Court denied Novell’s latest bid to revive allegations that Microsoft withheld support for Novell’s WordPerfect word processing software and other applications in the rollout of Windows 95, thereby maintaining Windows’ market dominance. Novell, represented at the high court by David Boies of Boies, Schiller & Flexner, had sought more than $3 billion in trebled damages from Microsoft.