A zombie thread is a thread that hasn't been posted in for more than 6 months. Our webmaster wants us to start a new thread instead of resurrecting an old one. And for good reasons: The problem may have been solved, the question answered, some of the posters may no longer be with us etc.
Oops. I'm guilty of launching a few zombie threads then. I seen enough "Google is your friend" replies to posts that I try avoid drawing such a response. In those endeavors, I've resuscitated a bygone thread or thirteen. if I've offended anyone somehow, I plead ignorance (the proof is obvious) and beg forgiveness.