For recurring tasks that are assigned it would make things easier if reminders for each occurence could be enabled for the assignee. This type of functionality would reduce the need for sending manual emails requesting someone to complete a task.

When task is assigned to multiple users, a feature to show who all have completed the task will help in tracking the completion

Allow sharing of "To-Do List". I can create a new folder and share it. The task in the new folder show up in the To-Do List folder. I would like the option to share my To-Do List folder, so that the person I am sharing my To-Do List folder can see all my task and due dates.

Be able to remove the "Response Requested' on an appiontment email after sending it.

Tasks have a paperclip icon to indicate there is an attachment. It would be good to have a "notes" icon as well for tasks, so you can tell at a glance whether additional notes are sitting in the task instead of having to open up the task to see whether notes exist.

Please update outlook tasks to allow an assigned task to be recalled and updates if the scope of the project or task changes.

add "my day" function in outlook task (like outlook.com ver.)
so when we use calendar, we can also see "my day" in the sidebar

Option to repeat events/ tasks daily.

It would help a lot to be able to set a default reminder for each recurring task in the recurrence dialog.

Some way of tracking tasks/projects when you send. rather than individual emails coming back and having to track. If you send an email or a new format of say a Task Email as they complete they can click done or something and there is a running total of who has completed it and when.

The daily briefing emails currently have options for Done or Not a task, it would be great if there was also an option to schedule a task. The idea being that I said I would do this task in 2 weeks time so let me book that and remind me about it on that day rather than 2 days after I said I would do it.

Automatic mail trigger for task reminders before due date and on due date and Escalation mails if task not completed on due date.

provide "assign alert to recipient". This option exists in the email.
Provide "assign multiple tasks" to one recipient at a time

We can see our tasks from One Note. Can we also have TEAMS and PLANNER tasks be linked to Tasks as well?

While in calendar view, when a task is dragged from the task pane to the calendar, the created calendar event is shown as "busy" by default. My idea is to have a setting were dragged tasks create "free" or "tentative" events by default.

When deleting a Task item that has a recurrence schedule set, you are presented with an option to delete all tasks for this recurring Task items or delete just the one recurring item. The default currently is set for deleting all of the recurring Task items associated with the Task in question. It seems that this is not a "fail safe" approach. The default should be that only the one Task item would be deleted, unless the user manually selects the "delete all" option.

One should be able to just drag and drop tasks from the planner and from ToDo into outlook Calender, Thus you can schedule your personal working day, no matter what preference you have for a ToDo-Application.