Ginsburg, Chief Judge: In United States v. Microsoft Corp., 253 F.3d 34 (D.C. Cir. 2001) (Microsoft III), we affirmed in part and reversed in part the judgment of the district court holding Microsoft had violated §§ 1 and 2 of the Sherman Antitrust Act, vacated the associated remedial order, and directed the district court, on the basis of further proceedings, to devise a remedy "tailored to fit the wrong creating the occasion" therefor, id. at 107, 118-19. On remand, the United States and certain of the plaintiff states entered into a settlement agreement with Microsoft. Pursuant to the Antitrust Procedures and Penalties (Tunney) Act, 15 U.S.C. §§ 16(b)-(h), the district court held the parties' proposed consent decree, as amended to allow the court to act sua sponte to enforce the decree, was in "the public interest." Meanwhile, the Commonwealth of Massachusetts and several other plaintiff states refused to settle with Microsoft and instead litigated to judgment a separate remedial decree.