http://xbox.ign.com/articles/627/627686p1.html
June 21, 2005 - Microsoft wants the Xbox 360 to sell 10 million units in its first 12 to 16 months, according to comments by Peter Moore, Microsoft's corporate VP of Marketing and Publishing, at the International Games Summit in London.
Moore hesitated to predict where Xbox 360 would stand by the time Sony's PlayStation 3 arrives, given that Sony has not announced a specific release time. However, Microsoft understands the importance of launch momentum.
"We don't know exactly when PS3 will launch, and I'm not making an official forecast for the 360," MVC reports Moore as saying, "but we do know that there is a target of the first 10 million units when you launch a new format."