"It is a bit ironic, but the fact that Apple currently has such a small market share versus Microsoft 's Windows means that there are far fewer hackers writing virus code for the Macintosh operating system, " says Pile, who notes the premium IT managers place on system reliability.

FORBES: Apple's New Core

Thousands of computers running Microsoft's Windows XP operating system were unable to connect to the internet after installing an anti-virus update.

BBC: Kaspersky anti-virus cuts web access of thousands of PCs