Calendar would be more useful if...
1. could accept requests from people using google calendar directly (.ical attachment for example)
2. could add others to my calendar invites even if they don't use proton mail or calendar
3. (and more obvious) mobile app version
Thank you for the calendar! I think it works really well and this will enable me to stay with ProtonMail long-term. Also concur with sgsen's comments above to make the calendar truly functional (esp #2 and 3).
YES YES YES!!! The ProtonMail calendar is a huge frustration when using this account for work.
Philip Lederer MD commented