How to mark a task complete in Outlook?
When completed a task, you may need to mark it as complete to indicate the task has been done. And Outlook provides you with the function of marking a task as complete. For detailed information of how to mark a task complete, please look at the following instruction.
Mark task complete by right clicking
Mark task complete by clicking the red flag
Mark task complete by checking the checkbox
Mark task complete in the opening Task window
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Mark task complete by right clicking
1. Shift to the Task view by clicking Task in the Navigation Pane.
2. Right clicking on a task you want to mark complete, and then select Mark Complete from the right-clicking menu. See screenshot:
3. And then your selected task has been marked as complete, the item is displayed in gray strikethrough text. See screenshot:
Note: You can mark a task complete directly in the To-Do Bar. In the Task section of To-Do Bar, right clicking on a task and then select Mark Complete from the right-clicking menu.
Mark task complete by clicking the red flag
You can click on the red flag 
to mark a task as complete in the Task view or in the To-Do Bar. See screenshot:
Mark task complete by checking the checkbox
1. Change your task view to Simple List view by clicking View > Change View > Simple List. See screenshot:
2. Then check the checkbox 
before the task to mark this task as complete.
Note: In this Simple List view, you can also use the above two methods to mark the task as complete.
Mark task complete in the opening Task window
1. Open the task by double clicking it.
2. In the Task window, please click Mark Complete in the Manage Task group under Task tab. See screenshot:
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