Their turn around with Nadella is incredible and must be a really interesting story.
https://stratechery.com/2018/the-end-of-windows/
For the people that argue that CEOs don’t matter, this is another compelling example of how important top down direction and leadership can be.
Who argues that? Apple already gave us a solid proof of difference between a manager and great CEO decade ago.
Stuff like releasing Vscode and Powershell under the MIT license, porting SQL Server to Linux, developing WSL… Did Ballmer contribute to/enable any of that stuff?
Those specific things didn't happen under Ballmer or kick off under Ballmer, but some their predecessors did (the earliest open source projects happened under Ballmer; the Monaco Code Editor was started under Ballmer even if the trajectory to it becoming VSCode wasn't likely clear back then). You can't necessarily draw a straight line from Ballmer era to those those projects that you like, but you also can't connect all the dots without including some of the dots from the Ballmer era too. Ballmer wasn't the great villain a lot of retrospectives seem to want to make him. He was an infectious cheer-leader and sometimes his cheer-leading led him astray (especially in trying to force people to use Windows/Office, instead of trying to encourage people to want to use Windows/Office; probably the biggest distinction between Ballmer and Nadella, and even then it doesn't seem that wide of a gulf as people make it out to be), but his intentions were in the right place and some of his instincts still lead the company in the right general direction (eventually).
I don't buy the 'things were in motion' while he was there, I think if they were it was in spite of his direction, not because of it.
It helps that Jobs himself hated DRM on music so much that he was willing to give up a legitimate competitive advantage to improve the customer experience.