GNOME is the most popular desktop on Linux, being used by the most popular distributions, including Ubuntu. One of my favorite features that it has is GNOME Online Accounts (GOA), a background service that allows you to seamlessly access your data from several providers using the system apps like Calendar and Files.

Google, Microsoft, and NextCloud are fully supported. It would be amazing to have this same level of support for Proton. I'd love to be able to seamlessly use Proton Mail in Geary without having to setup the bridge, upload files to Proton Drive using GNOME Files and create events in GNOME Calendar.

I don't mind the hurdles for the time being, but honestly this is the only thing that is stopping me from going and buying multiple years of Proton Unlimited.

With that out of the way, here's some technical information that I've gathered on my own:

• GOAs email integration supplies applications with the IMAP and SMTP configuration they need to use, so a bridge would still be necessary, though for the code to be merged into GOA, it would probably have to be in C, which would mean a reimplementation just for this. Alternatively, it might be possible to make it so that GOA providers can require that a given name be registered with DBus, and then the existing Go implementation could just register itself with DBus once its connected, and have the Go implementation give GOA the SMTP/IMAP login info through DBus.
• Calendar integration would require CalDAV support
• Contacts integration would require CardDAV support
• Files integration would require a custom GVFS mount

According to one of the GNOME developers, they are "fairly sure" that this support won't be added by them anytime soon, due to the technical complexity. However, if Proton itself contributed the code, I'm sure they would be willing to merge it, assuming Proton continued to maintain their piece of the code.

Thanks for your consideration.