This is crazy. You killed the lists without allowing people to gracefully get in touch and settle, as a group how they wanted to continue to communicate.
You killed of a valuable resource and are basically saying "we killed off something you liked without any notice, but we are offering you a crappy add filled experience, that you have to log into, and remember another set of passwords and such, to make up for it. Be happy."
um no. I have seen the forums and my experience is that the lists had more mature and knowledgeable users. Not to mention they were not moderated in the same way. Oh well. If a single simple mail server is too hard for you to manage, I wont expect much more here.