I came to this conclusion after reading this TechWorld story that described the devastatingly simple way that Mayer learned that her workforce was slacking off at home — she simply checked the VPN logs and found that far too many over her employees weren’t using them for significant portions of the day. This is important because logging into VPNs is presumably a key requirement for Yahoo employees to have secure access to work email and other resources that they need to do their jobs.
What makes this particularly galling is that logging into your VPN at the start of every day and keeping it open is not some crushing burden. In fact, it’s entirely possible to do relatively little work during the day all while keeping your VPN up and running. That many Yahoo employees apparently couldn’t be bothered to virtually “punch in” during work hours shows that they weren’t even dedicated enough to competently fake doing their work.