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Reversing a long trend, one research firm says Yahoo and Microsoft have posted gains in search market share — at the expense of industry leader Google. ComScore reports that 61.5 percent of all U.S. searches went through Google in June 2008, 0.3 percent less than in May 2008. Yahoo saw 20.9 percent of the searches in June, up from 20.6 percent in May. Microsoft went from 8.5 percent to 9.2 percent. Does this argue for a Microsoft-Yahoo merger? Not especially, since those small, hard-won gains would likely evaporate while the combined entity fumbles for years in post-deal internal politicking.