From this question: http://superuser.com/questions/89767/saving-enlarge-image-with-web-pages
We have a new user who asked a question on StackOverflow, not knowing it wasn't appropriate for his question. Someone told him it will be migrated (as an answer, but anyway), and indeed, it got migrated. He understood the migration, has no problem with it.
However, he lost ownership of the question, since he didn't have an account on SuperUser when it was migrated. So now, we have several possibilities:
Advise him to link his two profiles (even though his SO profile means nothing, it's as new), then flag for a moderator to link the question back to him (if possible, I'm not fully sure), so that he will finally be able to edit his own question and comment on it?
Advise him to ask again his question on SuperUser, and vote/flag to close the migrated one as a duplicate of the new one?
Do nothing, and let him handle his question without possibility to edit, comment, or accept answers.
The first solution seems the best, of course, but from the point of view of a new user, it's an incredible hassle. All this "procedure", just to ask a simple question. Second one is a bit "bad practice", but it's the fastest and easiest way for him to have a question he can actually "work" with.
So what to advise, in this case?
Edit: According to Jeff's answer, I was obviously mistaken on the behaviour of association and migration. In my mind, you had to create and associate accounts BEFORE migration, because it would be too late after. Apparently associating after gives the ownership back, so there is indeed no such problem.
The correct behaviour in this case is indeed to vote/flag to migrate, and explain it to the user, as well as telling him to associate both accounts.
(And on a sidenote: yes, please, explain that a question will be migrated, and why, instead of only saying "not something related", and adding "belongs-on-something" tags.)