Sync Calender & Contacts beween Protonmail and Nextcloud
I am a dedicated Nexcloud user (encrypted, 2FA secured & setup on my own private VPS) and I am using Nextcloud to sync contacts and calender between different devices and clients: Android, Linux, MacOs, Thunderbird. It would be very nice if there was a way to setup sync between my Nextcloud and my Protonmail account as well. Until this can happen I will not use the Protonmail calender (too much effort).
Only because it is necessary I manually update my contacts between my Protonmail account and my Nextcloud. This is a bit of a hassle though...

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Anonymous commented
Especially the sync of the contacts would be nice! Since the new Protonmail also shows contact-pictures in the inbox, the sync would be awesome (otherwise you have to upload each picture on your own)
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Ryan commented
I am currently struggling with this, currently just having to export/import.
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Michael Owens commented
I keep my contacts on a NextCloud-based CardDAV server. I would like to be able to "hook" my ProtonMail contacts to the CardDAV server so I don't have to do an export-from-carddav/import-into-protonmail cycle whenever I add/modify/delete a contact on the CardDav, or the reverse when I do the same in ProtonMail.