European Union antitrust regulators are seeking to ensure that an offer by U.S. software company Microsoft to give users the chance to choose rivals' Web browsers was workable for consumers and its rivals.

Microsoft proposed to the European Commission in July to install a ballot screen that would allow users to set up rival browsers on its latest Windows operating system, a move which could end a decade-long dispute with the EU executive.

The Commission, competition watchdog for the 27-country European Union, has to date slapped a total 1.68 billion euros ($2.47 billion) in fines on Microsoft for infringing EU antitrust rules.

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