I think microsoft views Sony as an enemy. With that said, I don't think microsoft likes Nintendo either. But there is an old saying- the enemy of my enemy is my friend. So thats probably why microsoft is making games for DS, but not PSP (viva pinata, diddy kong racing, ect)
I don't think microsoft is trying to let Nintendo win the console war though. I think they want to win, but more than winning, they want Sony to lose. In doing so, they have indirectly given Nintendo a very very good shot at victory.







