(Updates with share reactions in third paragraph.)NEW YORK ( TheStreet --Ultimately, the Microsoft ( MSFT)- Yahoo! ( YHOO) search partnership says more about the power of Google ( GOOG) than it does about MicroHoo. The on-again, off-again courtship between Microsoft and Yahoo! could only be consummated because the two former juggernauts have been sidelined by Google in the all-important financial boondoggle known as Internet search. In the markets, the news was treated as an indictment against Yahoo!, whose shares are down about 12% in recent trading while Microsoft stock ticked up a few cents. Google shares are down 1%.