These emails were released as part of the antitrust lawsuit against Google currently being pursued by the FTC. It seems to me that contrary to the FTC's claims about how Google's monopoly power leads it to stop innovating, exactly the opposite is true. If Google had stopped innovating it's clear that Bing eventually would have caught up in terms of quality. As these emails make clear though, Google kept its lead by continuing to invest in cutting-edge AI research.

Indeed, if anything it's Microsoft who should be scrutinized.