@damienl Yeah, I know Thunderbird works great—but in KDE, you have to use KOrganizer so that the calendars also show up in the taskbar’s calendar overview. There’s no other way around it. And I use that feature all the time—just a quick click on the date with the mouse, and you can instantly see your upcoming appointments at a glance without having to open the calendar app first. Anyway, I’ve switched back to GNOME and GNOME Calendar. That works without any issues.