You can convert mail messages to To Do items so that they appear in your To Do list. For example, you can convert a mail message from your manager that asks you to prepare your department's budget for next year to a task, which adds that message to your To Do list so that you won't forget to follow up. To convert a mail message to a task, do the following:
You also can create new tasks from Calendar entries. If you're creating an entry that also happens to be the deadline for a task, choose Copy Into New, New To Do from the menu. Change any information in the new To Do document and then save and close it.
Existing tasks often generate new tasks, and you can create new tasks from an existing task document. With the existing task selected or open, choose Actions, Copy Into, New To Do from the menu. Complete the new To Do document, save it, and close it.