Microsoft has secured 30% of the search market, largely at Google’s expense, according to data from Experian Hitwise.

The new March numbers claim that Microsoft achieved 30.01% of the U.S. search market share in March — 14.32% from Bing.com and 15.69% from Yahoo Search, which Bing now powers. The growth was pretty evenly distributed as well: Bing.com’s search market share grew by 6% from February while Yahoo search grew by 5%.

 

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Google, on the other hand, now controls 64.42% of the U.S. search market compared with its 66.69% share in February. What’s worse, Google’s market share is down 10% from August 2010, when it owned 71.59% of the search market. August was the first month Yahoo Search was powered by Bing, and since then, both search engines have grown. This is especially true for Bing.com, which only had 9.87% of the market in August.

One of the reasons why Yahoo and Bing may be gaining on Google is that users are apparently achieving more success out of Bing-powered search: 81.14% of Yahoo Search users and 80.32% of Bing.com users clicked on a search result and visited a website. Google, on the other hand, only achieves a 65.91% success rate, according to Experian Hitwise’s numbers.

While these are only the stats from one analysis firm, they match up with trends in comScore’s data as well. Google’s growth has flatlined while Bing has been on the rise. It’s a much different story than it was early last year, when Google was trouncing Yahoo and Bing.

Google still controls two-thirds of the market, of course. The search giant has been working on a lot of new features for its flagship product, including +1, social search, Google Instant and the ability to block unwanted website.