Back in October 2015, Microsoft revealed that they would no longer be releasing sales numbers for the Xbox One. Some outlets reached out to Microsoft for comment on the matter and they revealed they are using a different “key metric for success.”
A spokesman told Variety:
“We are continuing to look at engagement as our key metric for success and are no longer reporting on total console sales. During Microsoft’s FY18 Q3 earnings, we announced that gaming revenue grew 18% year-over-year, driven by Xbox software and services revenue growth of 24%, and Xbox Live monthly active users grew 1% year-over-year to 59 million. We continue to see strong growth with time spent on Xbox Live, and look forward to bringing more unprecedented experiences on Xbox One, Windows 10 PC and mobile.”