FastMail makes importing or exporting your calendar events simple. You can upload events, or download the data from any of your calendars, in industry-standard iCalendar format.
To import events into one of your FastMail calendars:
.ics) file you want to import and click the Select button.
Your events will be uploaded and imported into the calendar. If the calendar already contains one of the events you are uploading, the details in the event will be replaced by those in the uploaded file.
To export one of your FastMail calendars:
The calendar will begin downloading. Depending on your browser settings, you may be prompted for where you wish to save it on your computer, or it may be automatically downloaded to your Downloads folder.