- Timed tasks show on the right day in the calendar's month view (evening tasks were drawn on the next day in the Americas).
- The Today panel shows evening tasks and events on their own day.
- Today & Overdue and the Due filter no longer include tomorrow's all-day tasks.
- All-day tasks and events from the server keep their date in Europe, Asia and Australia (they were saved one day early).

- The Daynizer button in Thunderbird's left sidebar no longer goes missing after Thunderbird restarts.

- Light mode. View → Theme: Match System (the default, follows Thunderbird's theme), Light Mode or Dark Mode.
- The contact form now starts with the Address book field, always shown, so a new contact's book is easy to pick.
- Moving a contact to another address book no longer leaves a copy behind in the old one.
- Deleting a task, event or contact that was changed on another device since the last sync no longer fails at every sync ("HTTP 412"). Your delete now wins.
- Deleted contacts no longer come back when the server couldn't delete them right away; they are retried at the next sync.

- Better on smaller screens: the filter bars stay on one line in a narrow window or tab, and their labels shorten instead of stacking.
- Reminders now pop up as notifications. Turn them on in Settings → Notifications; Thunderbird asks once for permission to show notifications.
- Importing contacts from a vCard (.vcf) file now works.
- Show several lists at once: Ctrl+click lists in the sidebar, on the Tasks and Calendar tabs. The calendar's List filter is now a checkbox list, and saved views work from either tab.
- Choose what the Tasks and Calendar tabs show when Daynizer opens (Settings → Calendars & Lists).
- New tasks and events go into the list you have selected (with none selected, your default list).
- View → Filters: hide the filters you don't use. Hidden filters still apply and can be set there.
- View → Saved Views: open or save a view from the menu. Views also remember hidden filters, the sort order and Month/Week/Day.
- Repeating events keep their clock time across daylight-saving changes.