One wrong tap, and an unfinished project (planned to perfection) has disappeared? Accidentally marked a task as complete in MS To Do? Worried about marking a repeating task undone? Find out here how to undo marking a task complete in Microsoft To Do ⤓ (Windows, Mac, Android, iOS and on the web).
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How to Undo Marking a Task Complete in Microsoft To Do
Time needed: 2 minutes
To mark a completed task as not complete in Microsoft To Do:
- Show the completed tasks for the current list.
Here’s how: Expand Completed in MS To Do for Windows, Android, iOS and on the web.
Mac: In To Do for macOS, select Show completed tasks from the list’s three dots menu.
Completed: You can also go to the Completed smart list, of course, to mark the task not done there. - Tap or click the task’s (checked) completion circle to uncheck it and mark the task not done.
Context menu: In MS To Do for desktop and the web, you can also click on the task with the right mouse button and select Mark as not complete from the menu.
Their word: Microsoft include information on using tasks in To Do help.
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How to Undo Marking a Task Complete in Microsoft To Do: FAQ
Is there a keyboard shortcut for marking a task incomplete?
No.
MS To Do does not include a keyboard shortcut to undo marking a task complete; shortcuts like Ctrl Z or Command Z do not work.
Want to use a task as a starting point? How to Duplicate a Task in Microsoft To Do
What happens if I mark a repeating task not complete?
Once completed, a task is essentially removed from the scheduled progression of repeating tasks. The repetition continues unfazed.
When you mark a repeating task complete in Microsoft To Do, it creates a new (repeating) task for the next due date.
If you then mark the already completed task as not complete, this does not affect the newly created task; it remains due at the scheduled date. Mark the original task done again, and, again, the newly created task remains unfazed and unchanged.
(Tested with Microsoft To Do 2.114–2.129; first published September 2024, last updated July 2026)