Not likely. Bill Gates offered 'name your price' and a golden pony to them, but old Yamauchi declined the sale. Apparently, japanese companies tied to national identity are impossible to buy (for foreigners at least).
I don't have any - I've read it in 'Game Over' book about nintendo, though if you google around for 'microsoft buying nintendo' there are a slew of stories about it.
Doesn't make sense to me. They've already got their own game platform, and devices that are connected to the TV. Why try to integrate a completely different platform into a gaming ecosystem that's already thriving?