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Microsoft wants to replace its entire C and C++ codebase, perhaps by 2030
(www.theregister.com)
This is a most excellent place for technology news and articles.
It seems like the actual windows kernel isn't that bad, it's mainly all the stuff on top of it at this point that is killing the OS
Which they could clean up, but it would mean killing backwards compatibility, which is arguably the only selling point of Windows.