I don't think this will affect us directly... or right now, but there have been a number of "warnings" on the internet about this Windows update.
I checked it out on my own computers and found that this "optional" update had been installed on my computers on 4/04/2014.
The warnings have to do with the "Free" upgrade to Windows 10, and the suspicion that the update opens up to potential ads for Windows 10 upgrades, and, there may be some plot to have future upgrades to Windows 10, come at a cost.
Don't think we should lose sleep over this, and not much to be done, but an interesting look at what could be a new advertising tactic.
Windows 10: 'Free' can potentially cost a lot
Googling "KB3035583" will bring up more articles on the subject.