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We've detailed how Yahoo has boosted its search market share with these 'tricks' last month.
When adjusted, backing out Yahoo and Bing/MSNís use of contextual shortcuts and image slide-shows from both May and April, Broadpoint.AmTech estimates that Yahoo's share actually declined roughly 30 bps month over month in May to 16.6%, while Microsoft Sites' share was flat at approximately 10.8%.
Google, after a small data collection adjustment to the April data (namely a change in how Google handles searches with typos), appears to have gained roughly 30 bps of share in May to 66.4%, says Broadpoint.AmTech
Google: 10.158 billion (up 152 million)
Yahoo: 2.908 billion (up 156 million)
Bing: (up 101 million)
source - Danny Sullivan's "Time To End The Bull#*$! Search Engine Share Figures?" [searchengineland.com]