User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.3) Gecko/20070309 Firefox/2.0.0.3 Build Identifier: 2.0.0.0 (20070326) Often in newsgroups people will reply to an existing thread, change the subject, and make it into a new message. This keeps it in the thread of the original message. Yes, bad form, but a lot of people do it, so it would be great to be able to break/split threads. Reproducible: Always Steps to Reproduce: 1. 2. 3.