Once in a while I come across an old (> 2 yrs, say) unanswered question of the type I cannot build XYZ version u.v.w. where u.v.w. is outdated by today. I guess, chances that someone bothers to answer these questions are next to zero, and personally I would rather have them removed. But closing (the option to vote for I have) means only that they cannot be answered but are still there. So should I leave them as they are?
Addendum: The question can be generalized to questions like this.