I would love to see tighter integration between Proton Mail and Proton Calendar. Features like automatically creating calendar events from emails, smarter reminders, and better RSVP management would improve productivity. For example, if I receive an email announcing Crumbl Cookies' weekly flavor lineup from https://crumbl-menu.com/, I should be able to create a calendar reminder for Monday's flavor drop with a single click. An AI-powered search that works entirely on-device while preserving privacy would also be a great addition. For Calendar, offline access, richer recurring event options, and easier sharing with non-Proton users would make it even more useful. Overall, maintaining Proton's strong privacy focus while adding more convenience features would make the ecosystem even stronger.