According to comScore's analysis of May search traffic, Microsoft's share of the US web-search market dropped from April, as Google and Yahoo edged up.

Google dominates the US web-search market with a 61.8 percent hold – according to comScore's data, a 0.2 percentage point increase from April's 61.6 percent. Google has a much bigger share here in the UK and elsewhere in the world, which makes the US an important battle ground.

Beleaguered Yahoo comes in second with 20.6 percent, also a 0.2 point improvement over April's numbers.

Microsoft comes in a distant third with 8.5 percent, 0.6 percentage points down from 9.1 percent in April. Also-ran's AOL and Ask each have less than 1/20th of the search market, with 4.5 percent for both in May. That represents a 0.1 point drop for AOL compared with April, and a 0.2 point bump for Ask.

The small movements with these monthly numbers don't tell the full story, though. For that take a look at comScore year-over-year data posted by TechCrunch and Silicon Alley Insider. You'll note that compared to May of last year, Google's market share has skyrocketed by 28.4 percent, Yahoo dipped by 2 percent, and Microsoft notched up 2.8 percent.

That translates to Google devouring the lion's share of the 16.4 percent overall increase in searches compared to last year.

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