Given State Department's history of "foot dragging" and "soft peddling" of any adverse information and evidence against Madam Benghazi, I'm betting that there are several elements in play here:
1. While the State Dept Inspector General HAD to conduct an investigation after a number of facts became public knowledge, I'm guessing they were "soft peddled" in order to put Her Heinous in the best light possible, given the circumstances.
2. I have absolutely no doubt that the Clinton Crime Syndicate and Hellory's campaign were given advanced copies of the report and the release was fully coordinated in order to do as little damage as possible;
3. Release of this report allows The Beast to claim publicly that this is 'Old News' when the FBI releases their report, and also takes advantage of the public's short attention span.
4. The emphasis that previous secretaries had violated the rules was probably inserted to make it appear that she was just conducting "business as usual" and that speed and expedience was more important than adhering to security standards;
Based on my experience with OIG at the agency where I worked, I would guess that the OESP auditors were not happy with the way Secretary Clinton skirted the rules. I’m fairly certain that the IT Security staff and NARA records officer for State would have been highly upset and were more than happy to fully cooperate with the auditors. Read what the report says about Hillary starting on page 39 or 83.
Her spokesman Fallon is going with the meme ‘everybody did it”. He sounds like a fool.