Not to say there aren't things they could probably be investigated for, but in the cases of search, cloud computing, and mobile Microsoft has actually been the 'underdog' competitor. They successfully gained inroads to cloud computing thanks to Azure, but Bing has never had the search market share of Google, and mobile offerings were never Android or iOS. Microsoft as the 'victim' of anti-competitive behavior would have been inconceivable 20 years ago, but technology changes that quickly and if you miss the boat you can find yourself in a very tricky spot.