It should be an invitation to check those questions and see if there are any that can be improved. Usually questions are there for one of two reasons:
- The answers aren't any good.
- Someone posted a good answer but no one really looked at the question.
For #1, it's an invitation to write a better answer than the ones already there. Or, for the people that can edit, update an answer to make it better.
For #2, you should upvote an answer. (In my opinion it's weird to see a question that's marked as best answer but with no upvotes.)