With company the size of Microsoft, and the number of products they have (it is in the hundreds if not thousands) I doubt if any CEO (even Bill Gates) has much impact on individual products.
He will work at a much higher level, as a sort of visionary, giving broad suggestions of where the company goes, rather than deciding on individual products.
For example, when Microsoft started the world was mainframe oriented, and the home computer was just a baby "toy".
Bill Gates had the foresight to see the future of "the PC in every home" and "the PC on every desktop".
He used a mixture of technical skill and dodgy business practices to make sure that almost every computer had Windows on it, and then that Office became the world wide standard.
So for a while the world was "Windows centric" and everybody had to have Windows applications.
Then Google came along and showed that actually you could do almost everything in a browser that you could do in Windows, and all of a sudden Microsoft could see their "Windows centric" world going away.
So now Microsoft are moving more to "Windows Live" where things are web based, like many of the Google products.
It is that sort of big decision, whether to move into web based programs while still offering the traditional Windows and Office that Bill Gates would have looked at.