In just three days we will be seeing Microsoft take the stage with a number of announcements, including the official reveal of Project Scorpio (its name, perhaps the price and release date), an update on Crackdown 3, Forza Motorsport 7, State of Decay 2, and much, much more.
In fact, Microsoft has so much they need to cover that they will be going over their average 90-minute show. The reason for the briefing taking longer than 90 minutes is apparent because Microsoft "had some games that just didn't want to leave out to hit the time so made a call to just run a little long."
You will be able to catch the E3 2017 conference for Xbox on the official Xbox Mixer Channel or on the Mixer app for Xbox One S. You’ll also be able to catch a live stream of the briefing on the Xbox Twitch Channel, YouTube, Twitter, and Facebook Live.
4K options are available on Mixer and YouTube.