Right-click the task you want to edit, then select Edit from the drop-down menu.
The Add/Edit Tasks form will be displayed.
Modify information of your selected task, then clickto finish.
When you are editing the start time, the end time will be selected with the same duration as previously defined. For example, you create a task that starts at 10:00 and ends at 12:00 (duration of 2 hours). When you edit the start time to 11:00, the suggested end time will be 13:00.
For shared and group calendars, you can only edit their tasks if you have the Edit permission on these calendars.
When editing the task, you can add, remove or download attachments by directly clicking their titles.
If you only want to change the starting date and time of the task, you can also use drag-and-drop feature to edit the time for the task directly on the Calendar View pane.
From the Add/Edit Tasks form, you can mark your task as done by selecting Completed from the Task Status drop-down menu.
Your completed task will be marked with a strike-through.