However, due to i am using the 'outlook.com' to log in windows now, i am unable to log into xbox apps and halo:spartan assault due to the fact that the xbox account of mine is still named after the 'gmail'.

I have reached microsoft support from the xbox guys before and they say they've nothing could help me.

Each time i clicked on the account settings on xbox.com  logged, it shows something like:

Oops... it should not be happening.