Remember how Amazon and Microsoft unveiled a team-up that would let Alexa and Cortana talk to each other by the end of 2017? As you might have noticed, that didn't quite work out as planned. Thurrott has pointed out that the voice assistant crossover still isn't available as 2018 begins. It's not clear why, either. Both Amazon and Microsoft have said that they expect to say more "soon," but that's no guarantee of news at CES or another imminent event.