By Bill Rigby SAN FRANCISCO (Reuters) - Microsoft Corp is to give away its Windows operating system to makers of smartphones and small tablets as it seeks to make more of an impact on those fast-growing markets and counter the massive success of Google Inc's free Android platform. Microsoft's move, announced at its annual developers conference in San Francisco, is an attempt to broaden the small user base of mobile versions of Windows, in the hope that more customers will end up using Microsoft's money-making, cloud-based services such as Skype and Office. Up to now, Microsoft has charged phone and tablet makers between $5 and $15 per device to use its Windows system, as it has done successfully at higher prices for many years with Windows on personal computers.



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