We're excited to announce that we've fully migrated the Xbox Forums to their new home, here on the Microsoft Community forums!
As of today, going to forums.xbox.com will redirect you here to the Xbox area of the Community forums. We've moved all of your existing threads over so you can continue and start conversations with the new forums experience.
We sincerely appreciate the feedback you have provided over this transition and can't wait for you to check out the new Xbox Forums!
Most likely. The original account must still be on the old console but I believe you can use the content between those profiles. There may be some exceptions. You can always shoot a line to Xbox Support on Twitter (twitter.com/xboxsupport)
to get a more definitive answer for your question. They are pretty quick to respond.