Microsoft don't count replacement units as shipped consoles in their reports.
Therefore this questions has been answered, but if you want to know how many consoles were bought from consumers due to RROD, only those count who didn't want to get their consoles repaired (3 years warranty) and bought a new one instead.
How many are they ? Maybe 2% of all consoles sold in the last 2 years and maybe around 5% in the years before that, where RROD was a much bigger issue. (Not counting the 360S since even lots of people with a working 360 unit upgraded)
Of course my guesses are not accurate, but it can't be much.









