Boston (US); Dublin (Ireland): Tuesday, 1st September, 2009: Microsoft's Bing search market share in the US grew by just 0.23% in August to 9.64%, the slowest monthly growth rate since its launch, according to analysis conducted by web analytics firm StatCounter. The firm's research arm StatCounter Global Stats also finds that Bing and Yahoo! combined declined slightly in August to 20.14% from 20.