If you release your products without restriction, you are engaging in unfair competition. If you place conditions on the sale of your products, you are engaging in restraint of trade. But there's a difference this time. To phrase it bluntly, you don't have to put up with this shit anymore. You see, previous victims were constrained because the goods they provided were material in nature and were bound by the laws of physics to a particular system of distribution.
Oil has to be drilled for and transported by tanker or pipeline.
Aluminum requires bauxite mining operations, smelting plants and a physical means of distribution to the consumers. Microsoft, however, creates and sells an intellectual product. It can be distributed via the internet, or the disks and CD-ROMS it resides on can be produced in any number of countries. Countries, by the way, which would be overjoyed to be selected as the new headquarters site for the largest corporation on the planet. Move, damn it.