Microsoft has announced a scheduled maintenance period for June 20 that will impact Xbox 360 titles and services. Taking place between the hours of 4 a.m. and 6 a.m. ET (8 a.m. to 10 a.m. UTC), the maintenance will affect games and services on Xbox 360 and Xbox 360 backward compatibility on Xbox One.
During the maintenance period, Microsoft says, you may be disconnected from Xbox Live "one or more times" while playing. While maintenance is ongoing, you can check up on the status with the Xbox Live Status page.
Aside from backward compatibility, it's important to note that this won't have any impact on Xbox One titles at all. Speaking of which, Microsoft recently announced Xbox 360 games will be joined by original Xbox titles on backward compatibility soon.
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