Interesting question i would like to know if thats possible just out of interest, and to check it out maybe,
But hotmail(msn) they wouldnt really allow that would they?
Gmail is competition for msn..
Since MSN want you to be with there service's eg: e-mail, instant msg'n, and etc ... tho even tho hundreds of hundreds 100205155 of people use hotmail and msn as it it,
Ok did a quick google, maybe you might need to pay for hotmail to forward, like the pop' accounts..