So it appears that it is possible to change the region of your Xbox Live account. That's great news since I've moved to another country and had difficulties buying games on marketplace since my credit card is issued in a region different from the account region.
The thing is though that I was in a PAL region and now I am in an NTSC region. Because of that I was forced to order my games from UK. After I change the account region will my console be able to play local NTSC games? What will hapen to my PAL games I already own?