I think CalDav is essential to use the calendar on multiple devices. Please add the support, it is very important!

Same here. On Gmail (which I'm currently migrating away from, if I don't have network, or the network is slow, I'm still able to view emails, especially if i need to check emails for references or information I need). I'm unable to do this with Proton, sometimes even the folders don't load.

Agreed. I signed up for premium because I just assumed that like any modern system, Proton's calendar would have CalDav support. I'm going to switch when my renewal comes up. Not having the calendar available in the field and not being able to merge it with other calendars makes it useless.

Agree - if there is a bridge available on iOS to the native calendar app, this will be so helpful. I can also have the calendar notifications / visibility on Apple Watch.

I agree with this
I also refer to another suggestion that integrates this suggestion:
https://protonmail.uservoice.com/forums/945460-general-ideas/suggestions/36650287-all-in-one-proton-desktop-app

This should be available on all platforms (starting with Android and iOS since they already have apps). Sync back once the network returns.

This is one of the missing features that prevents me to go to paid plan

Adding my voice here too. Sometimes the network is down and I need to access a boarding pass in my emails.

It's not necessarily an offline calendar that I need, but integration with offline applications. I'd love for Proton Calendar to be able to sync with Gnome Calendar so that I get proper integration into my desktop environment, native notifications for events, etc.

I agree. I love proton, and I like the proton set up, but proton calendar only via web and no option to make it work when offline is a problem. Currently for me I can't even 'view' when I'm offline.

+3. This situation has already caught me off guard multiple times where I suddenly needed access to an important email and the poor network really screwed me over.

Please review this request again!

I agree. Right now, I need to augment ProtonMail with MS Outlook just to get some basic offline functionality on my devices.

Is offline mode on the roadmap? Or at least caching already opened emails? Thanks

Yes this is key for me as well

It is May 2022 and still no offline mode for IOS? Protonmail privacy is of no use to me when i cannot access my own emails offline. I gave it a try, paid subscription and patiently waited for years. Time (and a patience) is running out though. Offline access should not be a special feature in a year 2022 but a standard part of service and it is a dealbreaker for me.

Seconded! I work in a country with erratic internet connectivity and need to be able to make entries on the calendar whenever I agree the appointment, without waiting minutes (or potentially hours) watching an unresponsive screen. Also when offline.

Seconded! Surprised there's not more upvotes for this

I often find it necessary to update my calendar in areas with poor or no connectivity. Since Proton Calendar requires an internet connection to edit events, I have to record the event details in a text file or a paper notebook, then remember to put the data into Proton Calendar when I have connectivity again. It would be very helpful if Proton Calendar would let me add/edit events without an internet connection, then automatically sync those changes when a connection become available.

Very good idea....I thought about the same issue...

Yeah, I wish to have this feature too. To update/add event even when offline. It will be nice, because there are sometimes need to work with the calendar without network.