See, when I went to his link I was still signed in already and it only asked if I wanted to link the gamertag they automatically gave me to the email address since an email address from @live = microsoft already.
Are you saying once you got to xbox.com (japan version) it then asked you to start a microsoft account???
Not saying it doesn't do that for you, just not me
I'll try again, thanks for the help guys...
Assassins Creed III (Xbox 360 GoD) - Currently FREE via Xbox Live China (works worldwide) 03-29-2013 - Slickdeals.net
Got to that link and read through it, there were some people having problems in there too, maybe you will see the same problem you are having. I'm sure it's just a simple thing. One thing I saw people doing was it was defaulting to USA on xbox.com Region...you have to change that.