Worldwide PC shipments in the second quarter of 2015 declined 11.8 percent compared to the same period a year ago, according to a report released by IDC on Thursday.

Overall, manufacturers shipped 66.1 million units worldwide, including desktops and laptops running Microsoft’s Windows and other operating systems. That was slightly less than expected. IDC said in its report that the declines were caused in part because PC sales during the same period in 2014 were boosted by people purchasing new computers to upgrade from Windows XP, which Microsoft stopped supporting in April of that year.

In addition, manufacturers’ channel partners reduced inventory in the second quarter in preparation for new devices running Windows 10, which led to shipment declines. Customers outside the U.S. were also affected by shifting exchange rates that at times raised the prices for computers overseas as some foreign currencies weakened relative to the dollar.

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