I've been using a local copy on my desktop using WAMP Server to test the migration.
I've followed all the directions as given in the J! 3.x migration forum, and kept hitting a wall with the migration. Nothing seemed to work.
I finally decided that I would have to find a migration extension. I checked all the various ones listed in the JED, but what blew me away was the demo video for Migrate Me Plus.
I bought it, tried it, and it works. PERIOD
It really got to be a pain to have to permanently delete 10 to 15 messages a day. I installed SPAMFIGHTER, and it integated with Kunena Forum immediately, the amount of SPAM I had to actually delete from the forum dropped from 15 to 1, and with the ability to block IP addresses, much of what was formerly posted, is now blocked.
I can't say enough good things about this extension.