Yes, you can sync the calendars from a google account, so you can see/modify all the calendars that you have on that google account. Fastmail becomes a client for google calendar. But you can also have your own personal calendars inside Fastmail, not synced with google calendar.
So from Fastmail you can see/modify the calendar in Google that’s been shared with you?
I’d like to be able to keep the shared calendar feature that I currently use in Google with my wife. It’s so handy for organising things.
Yes, you can sync the calendars from a google account, so you can see/modify all the calendars that you have on that google account. Fastmail becomes a client for google calendar. But you can also have your own personal calendars inside Fastmail, not synced with google calendar.