Reporting its quarterly results this morning, Nokia said sales of its Lumia line of Windows Phones have surpassed its expectations in the U.S., but struggled in other some parts of the world.

The company posted a loss of more than $1.2 billion, caused largely by its struggling Nokia Siemens Networks unit, which took a big restructuring charge. At the same time, sales of Nokia’s new Lumia line of Windows Phones were unable to make up for declining demand for the company’s traditional Symbian smartphones, as it shifts away from that lineup.

(Note: Post corrected to accurately state the size of Nokia’s loss. Thanks to the reader below for the help.)

“We have launched four Lumia devices ahead of schedule to encouraging awards and popular acclaim,” said Nokia CEO Stephen Elop in a statement. “The actual sales results have been mixed. We exceeded expectations in markets including the United States, but establishing momentum in certain markets including the UK has been more challenging.”

Nokia said it sold some 2 million Lumia devices in the first quarter, up from 1 million in the fourth quarter, as the company launched its Windows Phone in more parts of the world. However, Nokia’s sales of smart devices, including phones, fell by more than 50 percent to 12 million units in the quarter.

Microsoft is banking on the Nokia partnership to revive its fortunes in the mobile phone market vs. the iPhone and Android. The companies recently launch the flagship Lumia 900 in the United States, and the device has been selling out online, in a sign of the positive reception.

Microsoft reports its quarterly earnings this afternoon.

More on Nokia’s results: New York Times, Bloomberg News, Associated Press.

 

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