Hello there documentarian. we have read your message. We try to help you It s possible '''Export and share a calendar''' https://support.mozilla.org/en-US/kb/exporting-and-sharing-a-calendar https://support.mozilla.org/en-US/kb/changing-calendar-preferences ''Using a shared folder'' When the calendar file is stored on a shared folder, you may also have several Thunderbird instances opening the same calendar file, provided the proper extension is installed. Since a standard iCalendar protocol is used, even other calendar supporting products, such as Microsoft Outlook, may share the same calendar. Greetings Firefox volunteer.