In its decision 1C_14/2016, the Federal Supreme Court had to assess whether the agenda of the Chief of Armament was an official document within the meaning of Art. 5 of the Federal Code of Obligations, as swissblawg summarizes:
It [the Outlook agenda] is not merely a personal reminder that is intended to serve as a work tool for managing one’s own appointments. Its scope goes much further: The calendar owner is a member of the highest cadre of the DDPS. His agenda has a decisive influence on the entire administrative activities and processes in the Federal Office of Armaments (E. 2.5.2.).