From Microsoft’s blog post:
As you may have seen, on Friday Microsoft filed legal action against Samsung in U.S. District Court, Southern District of New York. Today’s legal action is simply to enforce our contract with Samsung.
We don’t take lightly filing a legal action, especially against a company with which we’ve enjoyed a long and productive partnership. Unfortunately, even partners sometimes disagree. After spending months trying to resolve our disagreement, Samsung has made clear in a series of letters and discussions that we have a fundamental disagreement as to the meaning of our contract.
Oh, Samsung. Keep behaving like this and no one’s going to want to play with you anymore.