[ocdtrekkie]

This is only partially true. A large issue is that most of the software that runs on top of their products is also locked down. So when people have business critical software that's no longer supported by the original developer there's no way to fix it if the operating system gutted support for something they depend on.

[nikanj]

Tailor-made business-critical software is supported in a completely different way than your average shrink-wrap.

"Sure we can update from Win32 to $modern. We estimate it to take between thirteen to seventeen man-months. You know the usual rate for a man-month, let us know when you want to start the project."

[throwawayish]

Let's not forget that there are still huge COBOL applications out there, still updated and maintained by rather well paid engineers.