<p>SEOUL (Reuters) - South Korean upstart Infraware Inc is in a David and Goliath battle with software giant Microsoft over a lucrative niche of the mobile office business and just like the diminutive biblical hero, it believes it can win.</p><p>Infraware already dominates the market for office software applications on Android devices and says it now has a killer strategy to extend that domination to Apple Inc handsets as well by giving its best-selling Polaris app away for free.</p><p>The contest between the $250 million Korean minnow and the $270 billion U.S. titan illustrates how small firms can outwit lumbering technology majors like Microsoft Corp, which has been criticized for being too slow to transfer its great advantage in office software to mobile platforms.</p><p>"What we're trying to do is add cloud-based services and make the Polaris app seamlessly accessible through multiple devices, then offer it for free," Infraware chief executive Kwak Min-cheol told Reuters in an interview in Seoul.</p><p><a href="http://www.reuters.com/article/2013/09/19/us-microsoft-infraware-idUSBRE98I06X20130919">Keep reading...</a></p>