Who's got the safest operating system? Apple, Google, Microsoft? According to one security expert, what really matters is who's using the OS.

Half of the enterprise computers running the aged Windows XP operating system are still relying on the soon-to-be-retired Service Pack 2 (SP2), a researcher said today.

Microsoft is urging users to dump the aged Internet Explorer 6 with a campaign that claims the browser is past its expiration date.

A just-published attack tactic that bypasses the security protections of most current antivirus software is a "very serious" problem, an executive at one unaffected company said today.