This is not a secret, and maybe some people are not agree, but Linux is safer than Windows, we just need to look around, big companies like Google, Yahoo, Dell, etc are moving in the Linux way.
Even as Dell ships millions of Windows 7 systems, the PC giant is making a bold statement on its web site. Indeed, if you look hard enough you’ll find Dell stating that “Ubuntu is safer than Microsoft Windows.” Moreover, Dell quietly says it plans to ship Ubuntu 10.04 systems in mid-2010. If you want to see it just follow this link
What's your opinion? it's just marketing? That's my two cents, let me know your opinion :D