3

I never saw any discussion on it in meta - but it seems common knowledge that it is unacceptable to both vote to close a question and also answer it.

What about questions that should be migrated?

If a user asks a software question in SO, and I voted to migrate it to SU, is it acceptable if I also propose an answer to it, in SO?

6

Yes, while some people don't like it when people put answers on dupes, it's certainly not the consensus.
For migration, there's no controversy, just go ahead and give a good answer, and it will migrate with the question over to the other site.

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