Boston, US and Dublin, Ireland, Tuesday, 1st June, 2010: Usage of web browser Internet Explorer 6 (IE6) in the US and Europe fell below the 5% mark for the first time in May, according to web analytics company, StatCounter. The firm's research arm StatCounter Global Stats reports that IE6 US usage has fallen to 4.7% from 11.5% 12 months ago. "At these levels web developers now have valid justific