A tab for unanswered questions exists.
I know the questions tab does exactly this, but how about a tab for (older) open questions? For example, I look back at questions from a year ago and there are open questions that have not been given a comprehensive answer (or, I'm sure in most cases, simply have not been accepted by the OP).
Would it be a good idea to bring attention to open questions that were asked over a month/three months/six months/one year ago that have answers but no accepted answers?
Here's an example to illustrate my point. A user downvoted the question because it's "wasting space and people's time" since the OP didn't answer/accept an answer, but what if the the OP's question was not fully answered?