Xbox 360: 1,660,000
Xbox One: 120,000
Though the Xbox only sold 530,000 units in Japan, it still had a descent showing. The Xbox launched late in the 6th generation so it was available for 3 years in Japan before the 360 was introduced. The 360 was available for a full 8 years before Xbox One was introduced. Delaying the Japan release of the Xbox One for a full year after the rest of the world didn't help it. Snub Japan and they snubbed back.
I think matching or beating the 360 lifetime sales would most certainly be considered a victory for Microsoft and would help build a solid foundation moving forward for future generations.
...to avoid getting banned for inactivity, I may have to resort to comments that are of a lower overall quality and or beneath my moral standards.