Here's when you can expect Xbox One's new dashboard and 360 compatibility to arrive

Microsoft is making its two biggest changes yet to the Xbox One tomorrow, and we now have a more concrete idea of when Xbox One users will be able to use the console's new dashboard and play Xbox 360 games.

As previously announced, the New Xbox One Experience will launch tomorrow, Nov. 12, along with backward compatibility for 104 Xbox 360 games. Larry "Major Nelson" Hryb, director of programming for Xbox, provided further details in a post on his blog today, saying that Microsoft will begin rolling out the Xbox One system update with the revamped dashboard at 12:01 a.m. PT. Hryb noted that because this will be a global rollout, some people will get the update before others.

If you have the console's "instant-on" power mode enabled, your Xbox One will automatically download and install the update in the background. If you're using the "energy-saving" mode instead, you'll have to initiate the download yourself by checking the System section of your console settings to see if the update is available. This patch is mandatory; anybody who hasn't updated their Xbox One with the New Xbox One Experience by Nov. 23 will be prompted to do so then.

While Xbox 360 backward compatibility is built into the system update for the new Xbox One dashboard, customers won't be able to take advantage of the feature immediately. Hryb clarified that backward compatibility won't go live until 12:01 p.m. PT, 12 hours after the update launches. At that point, users will have to refresh their libraries to see supported Xbox 360 games ready to install in their queue. They'll also be able to insert the disc for a supported title and start downloading a digital version.