Hi,
Tasks and to-do items are different items.
A task is an item that you create in Outlook to track until its completion.
A to-do item is any Outlook item that has been flagged for follow-up, such as a task, an e-mail message, or a contact.
We cant delete the To-Do list folder or Task folder. But if you want to show only tasks in the To-Do List, we can create a custom view that includes only tasks and/or only tasks from a specific Tasks folder. See:
http://www.slipstick.com/outlook/tasks/filter-the-to-do-list-to-show-only-tasks/
However, if you still want to remove the To-Do list, we can use Macro to achieve this goal, please refer:
http://www.slipstick.com/outlook/tasks/remove-todo-list-tasks-list-outlook/
Hope this helps.
Best Regards,
Steve Fan
TechNet Community Support