You know why? Because for most folks, perception *is* reality. Once Microsoft succeeds in "planting" the notion that netbooks based on Linux are somewhat inferior, only the geeks will buy them.
Apart from geeks and maybe a few of their family members who else do you think is buying the Linux machines? No one that I know wants anything to do with Linux no matter how much I explain its virtues. I get the standard reply of does it run office? Well open office is better because and that's when they usually cut me off.
So yes MS is planting the notion that the Linux boxes are inferrior but frankly no one is listening. The geeks already know it's FUD and it seems hardly anyone else wants Linux anyway.
The Tao is like a glob pattern: used but never used up. It is like the extern void: filled with infinite possibilities.