Microsoft makes for an unlikely David, and Linux an even unlikelier Goliath  but here we are. A few years ago, Linux was positioned as the “Windows killer.†Now, as Microsoft is ramping up its efforts in the netbook market, Windows 7 is being positioned as the Linux killer. Interesting that Microsoft is being cast as an underdog here, albeit one with about 70% of the netbook market.
This sounds to me like lowering expectations. Not that I’m knocking Linux on the netbook. Far from it  I’ve been a big believer in the concept since Asus released the Eee PC back in 2007. However, Microsoft still has many advantages in the netbook market  it’s just that its advantages are in its market share, marketing muscle, and strong position with OEMs, rather than technical.
Source : Windows 7 as “Linux killer� How times have changed! | Community, Incorporated | ZDNet.com | Windows 7: The Linux killer