1977 Bill Gates image secretly squeezed into Outlook 2010?

In what probably takes the award for today's strangest news, Ars Technica spotted that the generic user icon in the Outlook 2010 People Pane appears to use the outline of previous Microsoft CEO Bill Gates.  More bizarrely, the image the Microsoft developer(s) responsible for the icon have used is seemingly Gates' 1977 police mugshot, from when he was pulled over for a driving offense.

The default icon is used whenever Outlook contacts lack either a local image of the individual or one on Facebook or another social networking site that the People Pane can query.  Why they chose a picture of Gates – and this particular image – is a mystery, as is whether the man himself knows of its origins.