My SIG says 5 million lifetime(including digital). I'd say all the issues its had since launch has cost it anywhere from 250-500k sales so far. And the lack of marketing just as much as well.
It should still do about 4 million lifetime including digital but those too issues cost it from hitting 5. And another thing my 5 million prediction was on the upper side of what I've seen, and me being in the ms threads I've seen what the ms fans think. 6 million was the highest I seen.
Halo MCC will sell 5+ million copies(including digital)
halo 5 will sell 10 million copies(including digital)
x1 will pass ps4 in USA, and UK.







