Before the update to esr, the calendar tab listed only the first occurence of all events, when "All Events" was selected. Now all future occurences are listed, which makes it impossible to have a list of all events listed only once. I have about a 100 events which I used to sort by Title and Category, and I had access to all events under the same Category. Now a list of all events with all future occurences generates thousands of events, which doesn't quite make sense. With the setting 'Check for updates, but let me choose whether to install them', the update to esr was still made without my consent. If there is no setting to list only the first occurence of all events, I will have to switch to another email client.