Making Office on the Mac earns them money through direct sales and helps maintain the monopoly of Office and its file formats at the cost of slightly less incen

Making Office on the Mac earns them money through direct sales and helps maintain the monopoly of Office and its file formats at the cost of slightly less incentive to choose Windows over Mac. Making VS on Mac would earn them no money directly and would only encourage the creation of more Mac apps. At best, it might increase the takeup of .NET/Mono on Mac, which might mean more .NET apps, but no money since .NET runtime is free. I'm not seeing the incentive.