I didn't have a "com.apple.MailMigratorService.plist" file. But I nuked the others and restored the mail folders and preference files.

Opening Mail now. Fingers crossed. 82000 messages - 3 minutes of importing (on SSD)....

It didn't work. Same as before. There's only a single rule and it's one Apple put in there in this version. "News from Apple"

This is getting to be painful. If I could easily export rules I'd boot back up to Lion and do that... I'll see about that. I searched Google for the issue I'm having without luck finding anything.

I've already tried copying over the two rules files from Lion with no luck.