This question already has an answer here:
I sometimes read old questions in unanswered list to see if there're missing ones I can help. But a frequent situation is many questions has been answered perfectly while the OP doesn't accept as an answer. I'm sure about this because OP commented on answer with "Wow", "Great", "Thank you very much" etc. It is usually seen in groups of new or inactive users. The same phenomenon occurs on those whose answer is rather easy and simple as well as duplicated so that problems have been solved in comment, even not necessary for a formal answer. I wish some ways to put out these kinds of questions in unanswered list.