It depends on the specifics. If someone resurrects a long-dead thread to provide closure, that's great. But it's kind of senseless to pull up an 8-year-dead thread to say "me too;" or in this case to make a reply that should have gone in another thread anyway.

Of course, the flip-side to the argument against zombie threads is that when someone asks a question that was posed 8 years ago, the old-timers will invariably point to the dead thread and say, "you should have posted here." Which goes to prove, sometimes you just can't win.