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

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.

While some large enterprises have moved their information-technology infrastructure to a third-party managed service to save costs, small firms--especially startups--have come to rely on cloud services to cut initial outlays and help them focus on the core services and products.

Whether your business is a big fish or a small-fry home office, you can get hacked just the same, and the stakes are higher than a few canceled credit cards. Here are a few tips to protect your users and your networks--steps that even enterprise-class security specialists may slip up on.