My young son has a local account on my 360. I now have a One and wanted to know how to transfer his local 360 account to the One so he can keep his achievements/gamerscore. It appears that the One only allows accounts tied to an email address. I have no problem giving him an email address (that he doesn't know exists!) if necessary, but I don't see how that will allow him to keep his old progress and achievements from the 360.