This is part of the real brilliance and real motive of MicroSoft. At the top of their game, the bigwigs and the corporation sell stock. Then they publish a horrid OS and tell everyone at least 5 irrational things that will cause stock to fold. They still try to sell their brick grade junk at full pace during this, to still make what money they can. Then when the stock has hit bottom, the bigwigs and corporation buy it up and they publish a really good but slightly broken OS. People scream about the flaws, the stock stabilizes and then they fix those bugs. During each phase of the roller coaster, they do everything they can to manipulate the market.
They make a fortune out of selling really junk OS's and pumping stock up and down. Much more than they would ever make if they were a reliable, and decent corporation.