Deb - If you know this guy's wife, do her a favor and got to her with your story. Wouldn't you have wished someone had clued you in earlier so you could have tried to p[rotect your H and your marriage?
Of course, if H could get into the system to do that, it means others could get into the system and see all the emails he and OW had. Maybe now he'll realize all such discussions - even with you - should NOT be on office email???
And, it still sucks that H is so interested in oW that he even cares about what she's doing, but I'm glad that every time he does, he keeps finding more evidence to convince him he wasn't that special. Hopefully this will be the end of it.