The table indicates that Google's share growth (+7.0%) has come at the expense of RIM (-4.6%) Microsoft (-1.3%) and Palm (-1.1%). Apple's share continued to grow (+0.2%). The breakdown is similar for all of comScore's figures for the last six months.
Does it even make sense to talk about share growth coming at anyone's expense when the market is growing this quickly? Is the absolute number of RIM phones falling? At this point I doubt any appreciable percentage is accounted for by people switching from one platform to another.
RIMs sales are still rising and Apple's market share growth, which has been flat for about a year, translates into somewhere between 50 and 100% sales growth. Meanwhile Android sales are up 800-1200% so yes, it's mostly about who's getting the new entrants to the smartphone market.
