When Chrome was announced, I recall a reporter asked what Google's goal was in terms of market adoption within a year (10%? 20%? market share). They said that misses the point, and they weren't using adoption as metric, but rather they were tracking performance attributes of all browsers (how much better will the web experience get for everybody, regardless of browser). Absolutely brilliant. Now, Microsoft could try to do the same thing on the privacy front. Its a much harder play though.