Yes they are and from the Nokia interim report it says..
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 and the minimum software royalty commitments are expected to measure in the billions of US Dollars."

This sounds like the 250 could be close to the minimum. and given the reported sales this may only grow with sales. we will see I guess.