Re: I can't understand why anyone ever thought it was a good idea...
If you're in the public sector in the US, you REALLY do not want to be mixing work and personal stuff on any device. Anything you create as part of your job is subject to a Freedom Of Information Act request. This gets really "interesting" when you have to disentangle work email from personal email. And it's doubly painful if the request is of a punitive nature. (e.g., FOIA requests are sometimes used as weapons in divorces, in academia.)