Yes. You're right. That was the problem. Disabling the mapping of organizer and attendees solves the problem. Eventually, I moved the calendar backing store from my exchange network folder to a local data file and switched on the organizer/attendees mapping again. It works. Thank you! Thank you for this cool piece of software! :-)
CalDav Sync failed: Can't respond to meeting invite.
merged patch from Dennis Nowak: added documentation of 'terminate' command line option
fixed warnings
merged patch from Dennis Nowak: added 'terminate' command line option
german translation: fixed missing newlines in license text
added 'missing' to .gitignore
updated e-mail address