Q: Apple claims Macs to be more secure than Windows PCs. In the light of recent malware attacks on the Mac platform, there are several articles on the Web questioning this claim. What is your take on this matter?

A: Macs aren't invulnerable to malicious software. No computer is. But the people who produce viruses and spyware have traditionally focused on Windows—and still do, primarily. There have indeed been a couple of recent instances of malware that spread among some Macs in the real world. But bear in mind that, despite...