Thanks John.
Just as a little empirical evidence, I manually did zmtrainsa manually on my 4.0.3 installation 2 hours ago. In the last two hours, I have gotten 9 pieces of spam. Of those 9, 8 went into my inbox, and had to be eliminated by highlighting and clicking junk. This has been going on for the last two weeks or so.
Backup has just finished, off to upgrade...see ya on the other side.
--Storm