Major vendor backing has led Linux to emerge as arguably the one operating system that can stop Microsoft Windows dominating the server operating system market.
The Penguin is now beginning to make inroads into Microsoft's home territory on the desktop and handheld devices, incorporating other open source application software and middleware.
In the mid-range to high-end server market, Linux on Intel is replacing proprietary Unix flavours and, increasingly, Windows. It has also found its way into mainframes and become a favourite supercomputer operating system.
But while boardroom awareness is growing, so are concerns about limitations, hidden costs and support as Linux and open source detractors argue the case against it.
So the Penguin's progress may be slowed, but is there anything to stop it?
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