It's worth watching the then head of OS X talk about private API's at WWDC a few years ago: http://www.youtube.com/watch?v=jd97us27eSg http://www.youtube.com/wa

It's worth watching the then head of OS X talk about private API's at WWDC a few years ago: http://www.youtube.com/watch?v=jd97us27eSg http://www.youtube.com/watch?v=jd97us27eSg It's definitely a different philosophy from Microsoft's, but it's not like they don't take their API's very seriously.