lame attempt at categorizing users...
your categorization is incomplete, like most times when people start categorizing.
Category 4: People who got tired of being unable to carry a spare battery on the iPhone, lack of SD card slot.
Category 5: People who don't feel like having their hardware vendor dictate what they can and can not do on their phone, and who don't want to waste their time on an endless Jailbreak - update - wait - Jailbreak again cycle.
Category 6: People who just like widgets, who might even be happy with Microsoft's non customizable Windphone7, but have no reason to side-grade from Android, cause Android ICS is way ahead of Windphone OS, AND you can get better hardware for Android.
And here, we are back at Nokia: They used to be a hardware and software company with their own OS, which is a significant advantage Mr. Trojan Horse Elop just threw away. So now, Nokia is ONLY a hardware company.
One with nothing high end to show, except for a good camera concept.
If you have a great flagship product, like the Galaxy SII, the rest of your line starts selling better too, by association.
If Nokia - and by extension Microsoft want to get somewhere in the mobile market, they'd do well to build something for 2013 that can technically trounce whatever Samsung/Apple comes up with. Just being equal won't be enough.
So Micro$oft, you wanted your own Smartphone manufacturing bitch to give your mobile OS an in to the Market you carelessly squandered? So do get them to compete, or you will just have destroyed a great company in a very short time - for nothing.