Assuming they make that money, but it doesn't say how. For example, if they get a chunk of The Office sales or Bing's revenue to do so. Sure as hell is not going to be selling 42 dollars pro licenses, specially when you can use the tech in Bing and Office.

What is 100% sure is that Microsoft gets all the benefits of OpenAI for those products for a long time, even forever if they don't find a good revenue model outside Microsoft.