Microsoft is suing Samsung.
As part of a patent-sharing agreement reached in 2011 Samsung is supposed to pay Microsoft a royalty for every Android smartphone it sells.
Microsoft says Samsung didn't pay on time last fall and now is refusing to pay interest on the late payment.
In the lawsuit, Microsoft says Samsung made payments until Microsoft announced it was buying Nokia's smartphone business last fall.
And, it hasn't paid royalties since then.
Samsung has not commented on the lawsuit.
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