That's how patent licensing works (albeit a comically overaggressive caricature). Do you fundamentally oppose the concept of patents or do you think Microsoft is doing something else wrong by asking to be paid license fees by competitors using their patents?
I don't hold either of those views. I was just pointing out that the parent comment by sz4kerto seems to not be relevant to the question asked by NotOscarWilde.
From the announcement:
"Separately, Google and Microsoft have agreed to collaborate on certain patent matters and anticipate working together in other areas in the future to benefit our customers."
Last time I heard that was with Apple and was more like "I won't sue you for this and you won't sue me for that"
That's different than cancelling outstanding lawsuits.