After selling 1.3 million units in December during the holiday madness, it looks like Microsoft is having trouble keeping up with consumer demand in the past month or so. Jeff Bell, head of global marketing for Microsoft’s games division, said in an interview that they misjudged the post-holiday demand and are really running short of product in the United States.

“We’re literally out of stock in many stores. We think this will have an impact on our sales. It may cause the overall industry number to be down a little bit. Retailers have been really upset, they are on allocation. It is a lag I think we’re seeing in January and that may continue into February, then as spring ramps up, we’ll be able to meet that demand,” Bell said.

The comments were made a day before the release of NPD Group’s January sales data.