Windows Phone 7.5: What will make it a winner?   This much we
know: The smartphone market has room for two wildly successful
platforms.  I refer, of course, to Apple's iOS and Google's
Android. Both are blockbusters, and I don't see any reason why
they can't simultaneously thrive for years to come.  But is
there room for a third major player?  At the moment, with WebOS
undergoing an open-source reboot and RIM's next-generation
BlackBerry OS apparently nowhere near completion, only one other
phone platform has an immediate shot at being a contender:
Microsoft's Windows Phone 7.5. It isn't there yet. In fact,
Gartner's latest worldwide market-share numbers show Windows
Phone capturing a piddling 1.5 percent of the market, behind
five other rivals.  Nokia Lumia 800  Nokia's Lumia 800 phone.
(Credit: Nokia)  Still, the idea that Windows Phone might go
from being an also-ran to a solid success doesn't feel like
crazy talk. Recently, I popped the SIM card out of my iPhone 4S,
put it in a Lumia 800 handset loaned t