That's a rather confusing post, to the best of my knowledge Microsoft have never been a major player in the global mobile OS arena, Symbian's been the top dog for at least the last 6-7 years. So history repeating? How?

Devices cheaper on Android? I don't think so, look at the Nokia XpressMusic range or E63 phone, full featured smartphones and very cheap, with Symbian's single processor approach allowing a low BoM.

Finally, you're conflating Nokia and Symbian, Nokia make phones that don't use Symbian (N900 and the series 40 range for instance), and the Symbian OS is available in phones from more manufacturers than Nokia.