> That didn't prevent OS X, from a near bankrupt company in 1998-99 with ~2% of PCs in the US, to get to ~10-15% in the same timespan. And that while still introducing a whole new OS in 2000, and changing CPU architecture in 2005.
Oh my friend you're under-selling Apple.
Apple, the most profitable company in the world, didn't get more than 10-15% of the market share. They didn't break any API's either. And they created their own hardware.
> It's not even close. MS still supports running even Win95 apps to this day, whatever they used an "abandoned API", so that's a moot point though. Old VB apps still run fine, etc.
Linux supports that too. You can still have a KDE1 app running on your Desktop.
Nobody has the incentive to do that. But it's pretty doable technically. Just like it's possible to run a Visual Basic app on Windows.