I have an old account (like 3-4yrs old) and bought a new xbox360 a week ago.
The problem is that i can't connect or log in with my old account email and pass. it says thats its used by another.
then you think that you forgot to erase account then you sold your old box but as i see on my account here at this page i can see its never been used since i sold my box so that excludes that problem, so next step is that you uses your other live mail that never have had any live account and that says exactly the same (used by another)!!!
What makes this problem???