You can drag an item of one type into a folder of items of another type to quickly create a new item. For example, to create an appointment from an e-mail message, drag the message into the Calendar folder. Relevant information from the message is added to fields in the new appointment, and the entire message appears in the appointment body. Or, you can drag only selected text from an item to create a new item.
This feature, AutoCreate, works only with items of different types, such as a message and an appointment. If you drag, copy, or move an item into a folder that contains items of the same type, the item is copied or moved.
If you drag a meeting request or task request from your Inbox to Calendar or Tasks, the request is automatically accepted and an acceptance reply is sent to the sender.