It also put an end to the cold war during the early 1990s that began after Microsoft abandoned joint development efforts for graphical operating systems.

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First of all, you'll note that's MeeGo on this screen, not the droid we were looking for, but that's because the development kit can switch between operating systems by merely swapping out the microSD card.

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In addition, open source operating systems, applications and third-party tools are already in development.

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Among the 55 developers who work with both operating systems, 84% said iOS was best for ease of development, with Android at 5%, Windows at 2% and 9% unsure.

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Tizen and Ubuntu also use HTML5 in their development, something that should allow applications on both operating systems to be interoperable.

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Because Qt will enable Nokia to standardize its development, Elop said it would be able to bring improvements to its operating systems more quickly.

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Also, considering the speed of evolution of mobile device features and operating systems, evolving field requirements, ongoing maintenance of multiple platforms can cost multiple times the initial development budget over a five-year period.

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Browsers have become more important as more software development shifts to the Web and away from applications anchored to personal computers and their operating systems, like Windows.

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