Kind of. We all know that Apple makes use of Microsoft patents for OSX. We do not know the deals they have in place, but one can assume that Microsoft has the power to say, "Apple, back off Samsung or we will not renew our agreement for patents X-Y-Z.
So, it is not so much a matter of Samsung infringing Microsoft patents in the way you are thinking, and much more a matter of Microsoft using its entire patent portfolio to protect its licensees.
This is something Microsoft said they would do for anyone licensing Winmo8, so it would not surprise me to see this same deal being extended to Samsung.Update:
What ever the case may be, I think the more companies consolidate to form a front against Apple, the better. The sooner Apple is forced to stop all the bullshit it has been pulling as of late, the better it will be for us consumers.