[ThinkDifferent]

But since the MAC OS has such a small market share, not as many people are out there trying to find them.

Compare exploits against IIS vs Apache. Apache has a substantially larger market share, so by this reasoning it should have more vulnerabilities, but IIS has far more. No software is perfectly secure, but not all software is equally insecure. Microsoft's philosophy has traditionally put features ahead of security. They claim to be changing, but we'll have to see.

[Badger1]

Compare exploits against IIS vs Apache. Apache has a substantially larger market share, so by this reasoning it should have more vulnerabilities, but IIS has far more.

This is a straw man. I was not implying that a software’s market share correlated to the number of bugs in it, just to the number of people trying to find bugs in it. I’m sure there are operating systems with fewer bugs than Windows (and some with more), but there is no operating system with a larger market share than Windows.