My new Mashable column was posted this morning.

It begins this way:

There are now a number of companies — AppleGoogle,Amazon, and others — that have Microsoft in their rear-view mirrors, disappearing quickly on the horizon in a cloud of dust.

That kick of dust in the company’s face is being emitted by Apple’s iPhone and iPad, Amazon’s Kindle, and Google’s search and cloud domination. Microsoft’s own wild lunges into various technology segments are also contributing considerably to it being left behind. Take the company’s recent partnership with Barnes & Noble, where it took 18% of the Nook e-reader for $605 million in cash and future guarantees. This was a move to compete with Amazon, but can it really compete?

Read the rest here.