You can create a duplicate copy of an existing appointment, task, or reminder note as the basis for a new appointment, task or reminder note. When you do this, the original item remains unchanged; it is not retracted.
In the Sent Items folder or the Calendar, right-click the appointment, task, or reminder note that you want to duplicate, and then click Duplicate.
If you are duplicating just one item in a series of recurring items, select the item on the day you want to duplicate.
If the original item was a recurring item, click This Instance, All Instances, or This Instance Forward.
Make your changes, and then click Send on the toolbar.
A new appointment, task, or reminder note is sent, and the original item that you duplicated remains unchanged.