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Internet Explorer, as once bundled with Windows, became the star of its own anti-trust investigation. Later on down the years, the European Commission said that European users of Windows should be given the option of its own browser, rather than the pre-installed one in Windows.
Internet Explorer's browser marketshare has been slipping slowly in the past few years -- and was helped along by the 'EU ballot screen' offered by European users of Windows in a hotfix in 2010. Firefox eventually overtook Internet Explorer just after New Years 2011.