By Foo Yun Chee and Alexei Oreskovic BRUSSELS/SAN FRANCISCO (Reuters) - European regulators are preparing what could be a stern challenge to Google Inc's mobile software business in the coming months after a nearly four-year investigation into the company's Web search practices left rivals and European politicians dissatisfied. Two sources with direct knowledge of the matter said that with a new antitrust chief taking over in November, European regulators are laying the groundwork for a case centered on whether Google abuses the 80 percent market share of its Android mobile operating system to promote services from maps to search. The Commission has stepped up inquiries just in recent weeks, sending companies questionnaires that seek far more details than previous queries on the matter in 2011 and 2013. In one questionnaire seen by Reuters, respondents were asked whether there was a requirement set by Google, written or unwritten, that they not pre-install apps, products or services on mobile devices that compete with Google software like its search engine, app store and maps.



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