Companies may be legally required to keep &quot;work&quot; chat logs: <a href="http:&#x2F;&#x2F;www.wsj.com&#x2F;articles&#x2F;deutsche-bank-didnt-archive-chats-used-by-some-employees-tied-to-libor-probe-1438287685" rel="nofollow">http:&#x2F;&#x2F;www.wsj.com&#x2F;articles&#x2F;deutsche-bank-didnt-archive-chat...</a>