Microsoft's Bing has seen slow but steady month over month growth since it launched this past summer. However, September saw Bing's share of the U.S. search market fall to 8.5 percent.
New numbers from StatCounter show that rather than continuing its trend of acquiring more market share at the expense of competitors Google and Yahoo!, Bing fell by 1.1 percent (bringing the decision making engine down from 9.64 percent to 8.51 percent) while Google rose two full percentage points, moving to 80.08 percent, up from the 77.83 percent it had in August. Yahoo! also declined, moving to 9.40 percent from 10.50 percent.
This is rough news in itself, however the fact that its Bing's first decline since it launched in May.
"The trend has been downwards for Bing since mid August," commented Aodhan Cullen, CEO, StatCounter. "The wheels haven't fallen off but the underlying trend must be a little worrying for Microsoft."
Read more from StatCounter.