Microsoft Loses Internet Ground, Or Not? - Microsoft Blog - InformationWeek:
"Do the hit counters at ComScore have a different take on this situation? The Seattle Post-Intelligencer quotes a ComScore study that shows Microsoft's search share holding steady. However, that refers to October versus September search share. If you eyeball the one-year graph in that story, you'll see essentially the same decline that Neilsen found.
Beneath these two contradictory headlines, there is actually some consistent data. Microsoft has lost about 20 percent of its market share in the past year, but in recent months has seemed to stop the bleeding. Yahoo has even managed a slight uptick in searches over the past two months. It makes you wonder whether the now-unlikely merger of these two would make any difference when both are so far behind Google."