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By Bill Rigby NEW YORK (Reuters) – Microsoft Corp on Tuesday unveiled a larger but lighter version of its Surface Pro tablet as it ramps up efforts to make an impact on the mobile computing market and counter the popularity of Apple Incs iPad and MacBook Air laptop. At a presentation in New York, new Chief Executive Officer Satya Nadella made it clear that Microsoft, which recently acquired Nokias handset business, is committed fully to making its own devices, despite a lack of success for its phones and tablets so far. We want to build experiences that bring together all the capabilities of our company. Microsoft, which is recasting itself as a devices and services company, has not made much headway on the devices side, except for its Xbox game console. The Surface, launched in October 2012 and refreshed last year, has about 2 percent of the tablet market, failing to make a dent on Apples iPad.