[Brian]

I've toyed with this idea, but in the end I decided against it. It definitely can be confusing to have a thread brought back from dormancy, but at least it keeps the relevant conversation in one place.

I fear that the result of locking old threads would be a proliferation of "I see an old conversation about this but I can't post there so I started a new one" threads, which would in turn make it harder for folks to tell which search results had the info they were looking for in them.