"We point out that it is possible, purely from a technical perspective, for us to see your emails, address book and calendar data, if you have not encrypted them." It would be illegal for them to view your email because of German Law but from a technical standpoint it is possible. This other device is a pre-configured mail server at your home that stores all your mail. The two things are quite different. And this one I think if the software is opensource would be more secure.