The current One Microsoft is Ballmer's vision executed by Nadella. Ballmer absolutely deserves some credit for putting the plan in motion that lead to Microsoft's resurgence. Nadella did NOT take over the company and lead an about face on Ballmers plan. He did extend the plan to be even more open to letting other Microsoft products cannibalize Windows.

https://www.theverge.com/2013/7/12/4516806/one-microsoft-bal...