Need to export your calendar or import one from a different service? Here’s how to do that.
First you will need to export your calendar from the other service. Usually there’s a way in the settings to export it to an .ics file you can save to your computer. Once you do that, it’s as simple as clicking the “Import from File” button you see in the screenshot above.
You can import ical calendars into your webmail calendar. You can find different calendars to use on sites such as this one: https://www.calendarlabs.com/ical-calendar/
Just download the file, then go to your calendar in webmail and choose edit, then import/export. Import that file you just downloaded and then go look at the calendar!