The only way to both lock a thread and delete its content (or delete any message within it) is what I described in an earlier thread: you have to redact all the content of every message in the thread (or every message you want to delete). Then you can put whatever text you want into the last message.
The reason I didn't do it that way today was (a) it would have been a PITA (very long thread) and (b) more honestly, I forgot lol. So then I needed a workaround. Since the workaround so easy and turned out to be so successful (even though it lasts only about a week, which was all I needed), I wanted to let people here know about it.
--
J
(Please note: I prefer not to be contacted offlist.)
