TheWrap: In the wake of the devastating Sony Pictures hack last year, rival Viacom has instituted a new company-wide cyber security measure that will automatically delete emails from employees’ in-boxes every 30 days. The company has begun informing staffers on a rolling basis that they have 90 days to clean out their old email or put them somewhere safe before the new policy goes into effect. The first wave of email deletions should happen later this summer. The policy “is consistent with industry best practices.”