Hello,
When the Thunderbird Calendar is used for scheduling an event with invitees, one can send out invitations. The invitees also get automatically notified if the event is canceled or rescheduled.
However, the e-mail text sent out to the participants only ever contains "X hast invited you to ZY Event". If e.g. an event is rescheduled, it usually warrants an explanation that I would like to be able to put in this e-mail body, but there seems to be no way to customize the message. I would highly appreciate this feature!