Having a strong developer community is typically where Microsoft has excelled. What happened?
Even the biggest incumbents have already been left in the dust. I've been looking for some 'cool', high-quality symbian apps, and as far as I can tell there aren't very many.
The Android market is making a really strong showing. It's not to the scale of the iPhone app economy yet, but with stuff like the N1 and Desire coming out, the potential for Android's market share to increase is quite strong, and with that come developers. If Android phones were to become popular enough, I have no doubt that developers would desert Apple and its punishing app store policies and gateways in record time.
Is it much easier to develop for the iPhone over Symbian phones? Are iPhone users more willing to pay money? Or perhaps Apple makes the payment process easier for developers, who no longer have to set up their own payment processing?
I don't know what the answer is, but it's not just market share.