I live in Vietnam. Windows phone is certainly popular here, but I believe (relying on my own biased observations) that iPhone is vastly more popular. While iPhones are sold by official vendors, it's far more popular to buy "hand carry" phones that are imported by individuals. Of the ~10 people I know with iPhones, all are hand carried. They are cheaper than the official vendors (and not recognized in the IDC report).
Gray market imports are probably distorting numbers in the other countries as well.
Which makes me wonder where all those sold windows phones are. Android and iPhone is what I see around here in Bangkok.
Nokia has better low end distribution channels. I would assume all those Windows Phones are in the rest of Thailand.
Windows Phone in Vietnam are more of a cheaper phone (comparable to Android devices) rather than compete directly with the expensive iPhones. For those customers who can afford the iPhone, they will buy the iPhone instead of a high end Nokia Windows Phone.
A whole country full of tasteful and sophisticated people? I'll have to visit.