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While Linux's share of the desktop pie is still virtually nonexistent, it owns two arguably more important markets -- servers and smartphones. As PC sales decline dramatically, Android phones are continually a runaway market share leader. In other words, fewer people are buying Windows computers -- and likely spending less time using them -- while everyone and their mother are glued to their phones. And those phones are most likely powered by the Linux kernel.

Speaking of smartphones, one of the largest cellular providers is the venerable AT&T. While it sells many Linux-powered Android devices, it is now embracing the open source kernel in a new way. You see, the company has partnered with Canonical to utilize Ubuntu for cloud, network, and enterprise applications. That's right, AT&T did not choose Microsoft's Windows when exploring options. Canonical will provide continued engineering support too.