microsoft and apple has been enemies since the 80's.?
"Enemies" is perhaps a bit of an overstatement. They are competitors, nothing more, nothing less. Even athletes have respect for one another and I suspect the same is true of gaming companies. It is only among the fanboys that the notion of "console wars" really exist. Nintendo don't give a damn how many Xboxs are sold so long as it does not affect their sales.
Microsoft and Nintendo are competitors trying to reach the same type of gamers
Nintendo and Microsoft are really pitching to different markets at the moment. Sure, they are both Video Game Manufacturers, but it doesn't make them out and out competitors. Justin Bieber and Metallica both make music but their audiences are mutually exclusive. I doubt there are many people who own a CD by both artists.
Similarly Nintendo's main sales are in newly created "non-gamers" market (see Wii Sports, Brain Training, Wii Fit etc) and the connoisseurs of vintage gaming (Mario, Zelda, Metroid), while Microsoft mainly caters to an audience that favours pseudo-realism, sports sims and violence (Assassin's Creed, Halo, Call of Duty, FIFA). Of course it's worth saying there are probably quite a few people who own titles in all three of those areas, but I suspect most adults would have enough cash to get both the big Ninty releases and the Xbox ones if they wanted.
You might call me a traitor for this, but since I only play Nintendo for the vintage gaming releases I find that the Wiimote has done almost nothing to improve my experience. Super Mario Galaxy, Twilight Princess and Mario Kart would all have been just as good or better with a standard controller (luckily Mario Kart gave you the option to use it). In some ways it would make more sense for Ninty titles to come out on the Xbox or Playstation, where their are a lot of older gamers who would happily buy them but may not own a Wii. But this might dent Wii sales somewhat, and is probably not financially viable for Nintendo.