I have a nephew who has very poor judgement. The first time he asked to use one of our computers to check Facebook and his email I was very concerned that he would download malware. Then I remembered the Chromebook and handed it to him. Problem solved. It let him do everything he wanted to do and prevented him from causing any problems. Now every time he comes over he asks if he can borrow "that cool laptop that goes directly to the browser".
Portal is the game that first got my son really thinking about concepts like conservation of momentum, even though he didn't know that's what he was thinking about.
Take a look at NetDocuments. It's SaaS, so you don't have to maintain servers, and sharing documents between multiple offices is trivial. It includes digital signature functionality.
There's this island somewhere in the Pacific where they still use Apple II's to keep the world from ending. From the screenshots I've seen they don't appear to be running the old Apple OS on them, though.
Take a look at NetDocuments. It's a SaaS (Software as a Service) document management system. It handles millions of documents, can be accessed from anywhere, and is relatively inexpensive compared to maintaining your own servers.
Does Saruman shoot first in this version?