Please check out
this article and see if these tips can help you find out what your Windows Live ID (email) is. You can also go to
xbox.com/forgot for steps on retrieving this info.
If those steps don't help you'll need to contact
Official Phone Support. Toll free: (800) 4MY-XBOX or (800) 469-9269. You will probably be asked for more information on the Gamertag and to supply some console information so when you call make sure you'll be able to access your XBOX360.
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