It's 2025 and there is still no open source equivalent with an integrated datastore for contacts, events, emails, and tasks. The last time I checked, Thunerbir

It's 2025 and there is still no open source equivalent with an integrated datastore for contacts, events, emails, and tasks. The last time I checked, Thunerbird can't flag a contact for reminder, or set the same category for an email and a task?