Abstract: | Legal context. The article considers the influence of the commissionruling in the Microsoft case, forcing Microsoft to use its WINDOWS-trademark for an unbundled version of the program inthe light of the trade mark owner's properties rights. The scopeof these rights is determined by the function of the trade markand the rights that the trade mark laws confer to the ownerin case of infringement. Key points. Trade marks are protected as property rights undercommunity law. They are the embodiment of past investments andtransform the reputation of the owner into a bankable asset.Consumers rely on trade mark owners' control over quality. Thisis mirrored by the rights of the trade mark owner to stop interferencewith quality and image, in particular in the context of resaleof altered products. Any interference that would be considereda trade mark infringement if committed by a private party shouldbe considered an interference with the protected property rightif caused by a government agency. This interference is not justifiedby the public interest because trade mark rights also embodyimportant public interests. Practical significance. If the analysis proposed in the articleis followed, intellectual property rights have to be given greaterweight in shaping antitrust remedies. |