Bill,
I saw this when I sent emails to Trend Micro directly. It actually looked like everyone that I sent emails to from Trend Micro opened AND clicked on my email.
My guess is that they are using their product internally, and so if it is being used by their customers too, it is very likely that this is happening.
In my opinion it is still such a small percentage of the companies that are using it, that I wouldn't worry too much about it right now, I would however keep my eye on it and hope that this product does not become too popular!