Please let us choose a custom background and add more backgrounds and colors for the theme options also.

If a task is in My Day and is not finished, it is currently not rolling over to the next day--it is remove from My Day. The default should be that unfinished tasks in My Day stay in My Day for the following days until the task is done.

Ability to turn notes into sticky notes that can be linked to desktop (such as Notezilla)

I would appreciate if there would be a timer for focusing on productivity.
By adding a feature like this I would be able to manage my daily tasks and different categories and use the promodoro technique.

Process:
Start a timer
Work until the timer rings
Take a short break
Every 4 Pomodoro (work periods) take a longer break

Functionality:
- adjustable timer
- sounds
- Listing the spent time in a log section

There are often similar Tasks or Workflows in business. So it would be nice to have an option to define Templates for tasks/Workflows (Task with sub-tasks and dynamic reminders like 2-weeks after start). This would allow the user to manage internal processes with the todo-list. Maybe it's also possible to start a workflow by sending a mail to the todo-list and giving some attributes in the subject to initiate the details of the task/workflow.

Let's configure ringtones individualy for lists

Import specific music
Configure the volume etc

can change task font and size

Persistent Notifications/Reminder option!

It would be really useful to have an option that when a reminder is displayed, it keeps showing on the home screen until it's actioned or snoozed, like you can in iOS native reminders. This makes it much better as you are constantly reminded until you manually mark the reminder as complete. This would be so helpful and I've been waiting for this in Wunderlist for years. Please implement this if you can!

I use Wunderlist and I know the ability to share tasks is coming to To-Do but the one drawback with Wunderlist was not being able to assign a task to more than one person.

Please add a “today” smart list of things due today plus a weekly view

Or let Wunderlist continue

Allow your completed ToDos to be kept, logged, and searchable. This would allow people to have a searchable log of the tasks and it's notes they've completed if needed. This data can be linked into a user's OneDrive account and accessible with other Microsoft office tools.

Choose a list on your watch, and check off items as you go on your watch!

Outlook tasks have 3 priority levels and this app only has two.

Default Due Dates and Reminders for new tasks

Get notifications for incoming tasks and ability to mark them as completed from the notification.

It would be great if we could add our own custom priority list to be used for a list.

Flagged email feature is really a nice feature. but the "Open in Outlook" link, now it opens Outlook Web App (outlook online) instead of Outlook Desktop (if the outlook desktop installed). reasons are it will open the flagged email much faster with out openup an OWA session and majority users feel more convenient when working with Outlook desktop instead of Outlook Web App.