According to Nokia's fourth quarter earnings report – Microsoft paid Nokia $250 million in the quarter for "platform support payments".

Here's the quote:

Our broad strategic agreement with Microsoft includes platform support payments from Microsoft to us as well as software royalty payments from us to Microsoft. In the fourth quarter 2011, we received the first quarterly platform support payment of USD 250 million (EUR 180 million). We have a competitive software royalty structure, which includes minimum software royalty commitments. Over the life of the agreement, both the platform support payments…

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