Via the Wall Street Journal:
“I was cautioning folks about email and how we have had several occasions where Congress has asked for emails and there has been an electronic search for responsive emails—so we need to be cautious about what we say in emails,” Ms. Lerner wrote. “Someone asked if [instant messaging] conversations were also searchable—I don’t know, but told them I would get back to them. Do you know?”
“[Instant] messages are not set to automatically save as the standard; however the functionality exists within the software,” the technician wrote back. “My general recommendation is to treat the conversation as if it could/is being saved somewhere, as it is possible for either party of the conversation to retain the information and have it turn up as part of an electronic search.”
“Perfect,” Ms. Lerner replied.