Xbox boss Phil Spencer feels Microsoft has an obligation to continue supporting Xbox 360 owners alongside the third-party publishers.
Speaking with Metro during E3 last week, Spencer said "millions more" Xbox 360 consoles will be sold before its generation is finished.
"If you bought your Xbox 360 a year and a half ago, I think we have an obligation there," Spencer said. "When people make a £100+ commitment to us, I want to make sure that there's content for them."
Spencer said that while investing in Xbox One is important, it would be unwise for a console manufacturer to ignore the previous generation's install base, especially when third-party support still exists.
"Most of the third parties will support both generations for a couple of years," he said. "For a third party this is the nice part of the curve for the last generation, because you’ve got millions of people out there and they want to sell content that these people will buy.
"They also want to kickstart the new generation successfully, so you’ll see a lot of them doing a little bit of both. For us in first party, our primary focus is Xbox One. I’ve been proud of our first party line-up on Xbox One."