Microsoft is not a software company, they have never been experts at software. They are experts at contracts. They lead because their business machine exceeds at understanding how to tick the boxes necessary to win contract bids. The people who make purchasing decisions at companies aren't technical and possibly don't even know a world outside Microsoft, Office, and Windows, after all.
This is how the sausage is made in the business world, and it changed how I perceived the tech industry. Good software (sadly) doesn't matter. Sales does.
This is why most of Norway currently runs on Azure, even though it is garbage, and even though every engineer I know who uses it says it is garbage. Because the people in the know don't get to make the decision.