The reason for Microsoft not already owning Nokia is twofold: Nokia didn't want to sell, and Microsoft didn't want to buy. Both are entirely rational positions to hold. Nokia still has time and cash with which to mount a fightback. Microsoft has time to generate an "ecosystem", the clunky technology buzzword for what the rest of the world calls "markets".
What reasons...I have stopped reading The Onion, get all the satire dope from such posts now.