Would you like to co-innovate with us? If so, we’d like to invite you to become product development partners with us. Read more about it in our announcement Launch of the TeamViewer User Focus Program3>
Unfotunately, you will need to log in to each machine to change it's password. This has been requested as a feature more than a couple of times now. The ability to change the "Personal Password" via their policy system. Which would not help you because you are using TV7 and that predates the Policy system I think. Maybe they will add it in TV13? Here is to hoping!