Adding new seats is easy, but be CAREFUL!!! Once you add, they make it IMPOSSIBLE to reduce. They say its for "security." But really, they just want to keep billing you for seats you are not using.They provide a number to call if you need to reduce seats. You will get a very unhelpful, scripted response directing you to billing. If you call billing, they say you need to email "cancel@box" This is a blackhole that will get no response. From there, you can try submitting a support ticket which also will get no response.Any new seats you add are impossible to remove! This should be illegal, honestly it might be. Anyone file a class action yet?