Microsoft's Internet Explorer (IE), which again fell to a new market share low last month, is on a pace of decline that will push the once overwhelming dominant browser under 50% by this time in 2011, according to new Web usage data.

IE lost 0.7 of a percentage point to end April with a 66.1% share of the browser market, another new low as pegged by metrics vendor Net Applications Inc., which started tracking browsers in 2005.

As in March, the April gains by IE8, which launched that month, where not enough to stem the slide of the browser's overall share. While IE8 boosted its share by 2.2 percentage points, IE7 lost 2 points and the creaking IE6 lost 0.8 percent point.

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