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Welcome to Microsoft Pri0: That's Microspeak for top priority, and that's the news and observations you'll find here from Seattle Times reporter Sharon Chan.

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December 19, 2008 2:07 PM

Microsoft's U.S. search market share down slightly in November; Google dominates ad-serving market

Posted by Benjamin J. Romano

Microsoft's Live Search service had 8.3 percent of the U.S. search market in November, down from 8.5 percent in October, according to figures released by comScore. Yahoo's share slipped a bit, too, down from 20.5 percent in October to 20.5 20.4 percent in November. Market-leader Google again stretched its lead, gaining 0.4 percentage points to finish November with 63.5 percent.

Another market-share study puts Google in the drivers seat for serving ads.

Advertising Age reported on a study from content-tracker Attributor that measured server calls -- when a Web site accesses an ad server to present advertising to users -- across 75 million domains. Attributor normalized for server calls to more popular sites by applying unique user numbers, from, to each domain.

Google's ad serving systems together had more than half of the market, as measured by Attributor. The study was conducted in October, when DoubleClick had 31 percent and AdSense had 26 percent. But those figures were down 3 percent and 9 percent, respectively, from the last Attributor survey in January, AdAge reported.

Other major players in the study were:

  • Yahoo, 10 percent

  • AOL, 7 percent

  • Revenue Science 7 percent

  • Microsoft, through the Atlas system it acquired with aQuantive, 4 percent

Rich Pearson, VP-marketing atr Attributor, told Ad Age that Microsoft's small market share was surprising.

No doubt, Microsoft's new Online Services boss,Qi Lu, has his work cut out for him.

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