Heaven help me. I'm about to upgrade my antiquated installation of MT to the latest version. Since I don't have full shell access to the Linux server, this is going to be a bit of a bear.
My service provider mucked up some settings a couple of years ago and was never able to figure it out, hence I lost my blacklist for spam and had to shut down comments.
This is in aid of integrating plug-ins and getting anti-spam filters and comments to work again. After a successful migration (and probably lots of CSS/PHP hackage) I'll evaluate whether MT 4.0 is worth staying on. If not, it's off to WordPress.