Apparently, Samsung has an auto-delete feature that deletes employee e-mail on its proprietary system after a set time. While Samsung apparently took some steps to warn employees to preserve relevant emails after suit had been filed, it left on the auto-delete feeature. The judge has entered an adverse inference order in the suit. The order is here. It's too fact-based to summarize effectively, but Apple in part used the fact that there were many more relevant emails on the non-proprietary system than on the proprietary one to establish the fact of some likely harm.