But in the video he says they are starting with critical systems first.
Emphasis on starting.
So yeah, not as pervasive as you, the evangelists or that video title implies.
"Microsoft is Getting Rusty: A Review of Successes and Challenges - Mark Russinovich"
https://www.youtube.com/watch?v=1VgptLwP588&t=1903s
The only Microsoft divisions that are still all are into C++ is Windows and XBox, and still, C++/WinRT is now in maintenace, the team has moved into windows-rs, WDK now has Rust bindings available.
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But in the video he says they are starting with critical systems first.
Emphasis on starting.
So yeah, not as pervasive as you, the evangelists or that video title implies.