Ok - I screwed up and didn't read the line on the content rebuilder, but really want to go back to the total post count....
Rebuild Post Counts
Select this option if you want the user's post count to reflect his current number of posts, and not how many he has ever made.
WARNING: There is no undoing this once this is clicked.
I assume that there would need to be an intensive script that would go through every user and recount all the posts. Has anyone been able to do this? We have over 500 users.