When was Balthasar in:
Zurich, Bern, Basel, Geneva, Lucerne or Lausanne?

The travel calendar can be calculated from the phone movement profile.

Who are Balthasar's
friends and colleagues?

A network of contacts can be plotted based on the retained email metadata, without any information about their content.

Anyone who sends an e-mail to several colleagues simultaneously reveals that the colleagues know each other.

Balthasar's entire personal environment, consisting of family, friends and colleagues, can be determined based on his 22'324 e-mails.