Items 30-32 (from p. 9) seem pretty significant. Basically, other stuff like Gmail automatically went on litigation hold (where records are preserved), but Chat

Items 30-32 (from p. 9) seem pretty significant. Basically, other stuff like Gmail automatically went on litigation hold (where records are preserved), but Chat didn't. Google did warn employee about the problem with this and told them not to use Chat for any topics subject to litigation hold. But they left it up to employees to actually do that. And, very predictably, of course they didn't. Whether it's because they were careless, unaware, intentionally trying to hide things is another question. Regardless, it was an arrangement that basically guaranteed this sort of problem would happen.