One Gartner analyst called Cortana "Big Brother" combined with productivity, and asked some pointed questions about Microsoft's intentions.
At particular risk are touch-screen voting machines that have no paper trails. If those are hacked or a hack is even suspected, it will be difficult to prove—and impossible to reconstruct the real tally.
But even an all-U.S. team is no guarantee of security.
The goal is now an exascale computer by 2023, which will consume the output of a small power plant all to itself.