Xbox One units are back in stock on Amazon, though the retailer warns that they may not last long. In addition, though systems are in stock, they may require an extra 1-2 days to process, Amazon said.

　　PlayStation 4 units, on the other hand, remain sold out through Amazon. Microsoft has sold more than 2 million Xbox One units across the world since launch on November 22, putting its console in a dead heat with the PS4.

　　In the United States, the PlayStation 4 outsold the the Xbox One in November (it was released a week earlier), but the Xbox One was the fastest-selling console during the month.

　　Xbox executive Aaron Greenberg said recently that strong early sales for both the Xbox One and PS4 is "great news" for the industry at large.

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