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This is what the calendar looks like in the desktop version of Proton Mail. Image: Proton
The company has also introduced automatic forwarding of emails while maintaining end-to-end encryption. Admittedly, this option is only available to paid subscribers and only when sharing with other Proton users.
The desktop app is optimised for Windows and macOS. The beta version is already available to a small group of users. The launch for everyone is scheduled for early 2024.