That is when the PS3
outsold the Xbox 360.
Outselling is for, when, in a frame of time, the PS3 was actively selling more units than Xbox 360. In our case between 2007 and 2013.
I found
this chart with sales. A bit incomplete, but it's good enough. Here you can see how sometimes Xbox 360 is
outselling PS3 and sometimes is the other way around. But in the end, PS3
was outselling more often. You can also notice, how after 2010, both PS3 and 360, started
outselling the Wii but they never
outsold it.
I remembered something about 360 underperforming compared to Microsoft's expectations (10 million), but I wasn't sure about the number and where search for it. So I found it easier to "throw" the 10 million number. Sorry.