C'mon people lets get serious here. There was a precedent established by Powell to use private email to conduct some of the State Department's business. People who emailed her knew it was a private email address as it did not contain .gov. The additional fact finding that disclosed that only 3 emails contained confidential information that were denoted by a (c) in the body, that could have been easily overlooked. The emails themselves did not contain the proper headers to highlight the fact they contained confidential information, otherwise the (c) would not have been overlooked. The emails were only confidential in nature because they contained meeting requests, and not true state secrets.
This is like citing someone for jay walking because they stepped out side the crosswalk markings by an inch. Lets get a life and all move on.