I would make it controlled by voice. Just need to figure out a way to tell the user what the system can do. Computer, help me shop for medicin and hold up a box infront of the screen with what you use today. This should be simple. If you make it to complex like it is today then elder people will not use the computer.
Basically a personal assistent/guide driven OS. Start with rethink the experience you would have if you went to the mall and have a human assistent with a big screen to show you everything.
Yes, trail period of MS Office. But when it runs out then they have to choose what to do. Buy or pick anything else? I think the problem here is that they know they will get full compatibility with others if they buy MS Office. MS Office does not even follow their own protocol standard. Some know that the webbased version is free. That makes it really hard to compete. I hope EU fix this.