Oh yes, the wonderfully absurd arguments from the marketing folks. Nobody pays the total sum (assuming it's even actually that high - the assumptions of these pseudo-experts are completely arbitrary), since it's distributed across all companies. If you break it down to the individual employee, you save a few euros per year. The 6 minutes per day certainly doesn't justify the immense investments a company would have to make in an archive system. You need other motivations for that, not just a bit of email searching. But that's much more effective for advertising ...
At heise online news there's the original article.