Next question is "Who said 'Don't follow the policy.'"? That'll be harder to find, as I'm certain that there's no paper trail.
And if there was, it would lead to some low-level technical wonk (I've been one) who was "A Rogue", or somesuch. We'll never find out what happened, unless the RINOs in the house have enough spine to scare someone into spilling the beans. Or they find someone stupid enough to spill 'em, or someone with an axe to grind.
If Dave Camp sent a letter to the IRS stating that all emails should be preserved and if Lerner’s hard drive crashed, at the very least, the original hard drive should have been preserved as evidence. Somewhere, someone made the determination that the hard drive could be destroyed. So start with the IT department and find out who authorized the destruction of Lerner’s hard drive.
In addition, why would this hard drive end up in the CI Division’s forensic lab for examination and restoration? It is highly unusual for this to happen, unless someone wanted to make sure the hard drive was destroyed beyond recovery.
Nobody in their right mind is going to archive something that makes them look bad even if their is a policy that tells them to do so.