Today during Microsoft's E3 press conference, Xbox head Phil Spencer confirmed Xbox One will support backward compatibility with over 100 select Xbox 360 games by this holiday season.

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Digitally purchased games will start showing up automatically in your game library. Retail Xbox 360 disks won't work natively with the Xbox One, but will initiate a download of an Xbox One-compatible version when inserted. During the announcement, the Xbox 360 version of the original Mass Effect was shown running on the Xbox One.

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Xbox One backward compatibility is available now for preview members and everyone this holiday.

Brandin Tyrrel is an Associate Editor at IGN. You can follow him on Twitter at @BrandinTyrrel