Cmon Proton Team... It's time. This is a necessary function and has been a request for years.

I second the voice of others: as long as calendar does not show up in Outlook, I cannot use it.

I'd like to be able to see my Proton calendar on Gnome Calendar, which is what my Linux laptop uses by default. Thunderbird could be another great place to see my calendar, but I don't always have that application open.

Please add your votes to this thread regarding the same topic.
https://protonmail.uservoice.com/forums/932842-proton-calendar/suggestions/42301705-support-for-proton-calendar-in-outlook

I have recently discovered that it is possible to share your Proton Calendar as a Web Calender in Evolution. This gives you read access to the calendar only so, you still have to go through the website to add/edit events. Still though, it at least gives you visibility to that calendar alongside any other calendars you're tracking with Evolution.

No program integrates email and calendar as good as Outllok for desktop - so this would be awesom

Having access to Calendar via Proton Bridge would make integration much more straightforward. It is one function I missed when I transferred to ProtonMail. I can then edit an manage my diary in one app like evolution. The world does not need another Desktop App, just for Proton

Please make Proton work with Mail and Cal on MacOS and iOS. There is no need to build yet another mail and cal client I have to look at and manage!

Critically need calendar to work with my Mail and Calendar apps on MacOS. There's no need to spend so much time working on web-based Proton - existing clients are fantastic! Please make Proton work with them.

There are quite a few different suggestions for this feature, expressed in different terms, but a lot of people would like Proton Calendar supported by a application for Windows or Linux instead of needing to rely on a browser.

P.S. to my comments below - I would gladly pay a nominal fee added to my premium account to spur the Dev team to put into your product funnel as Outlook is the default email and calendar platform for every firm where I've worked.

Recently started using this more for my persona/professional activity. I can't see being able to use the calendar app this way in the long term. It would cause me to move back to O365 for the integration. The Outlook calendar support would ideally support adding Zoom/Teams/etc. meetings to it.

I do not keep my browser open all the time, and as I primarily use my laptop for on-the-go computing, I do not always have an Internet connection available. Even with a desktop computer on home WiFi or a smart phone, (rare) issues do sometimes occur with my carrier/Internet provider that prevent Internet access for short or extended periods.This makes integration with existing PIM (personal information management) applications crucial, both for access to event notifications even in those few rare moments where I do not have Internet access, and for the ability to sync up my calendars when I regain access to the Internet.

Ideally, a Proton Calendar Bridge application would support both CalDAV and WebDAV for maximum compatibility with PIM applications, though I would consider CalDAV to be the absolute minimum as most PIM applications will support this out-of-box.

I often need to rely on other calendar providers because I can't easily share / participate / integrate external calendars and their respective event invitations through Calendar.

Having bridge expose a CalDAV endpoint would definitely help alleviate some issues, like integration, but more needs to happen, such as external calendars edits / external editors of Proton calendars.

Also, if Bridge is to expose a CalDAV endpoint, I'm all in with a WebDAV endpoint for Drive.

Using the CalDav and CardDav protocols through the Bridge would be neat and, would probably help for maintenance.

Protonmail is an incomplete solution without contacts and calendar. Please add webdav and LDAP to the bridge so they can be access from a mail client.

This is critical to make this an integrated service. The calendar should have an associated Bridge tool similar to email.

Integrating the whole Proton package (mails, drive, calendar) with opensource, free, handy tools is paramount for a real life usage.
=> Calendar integration to Thunderbird is key

The calendar integration with Thunderbird calendar will simplify a lot my daily usage. One more in favour of implementing this feature.

Definitely needed feature to be able to use Fantastical or BusyCal on mac. The web based calendar in Proton is not delightful. These other calendar programs are really valuable for planning and organization. and integration to things that schedule you.