The landscape is changing, however. Apple’s market share of desktop computers is nearing 17 percent. OS X, Apple’s operating system, is popular with consumers and enterprises, making it a more interesting target for hackers.
….The jump in OS X malware also still pales in comparison to Windows.
“If you put all of the Mac malware that we’ve seen, and you combine those numbers for the history of OS X, basically it is less by a significant amount than the amount of Windows malware you will see in an hour,”