Outlook 2010 has an interested feature that lets you edit the email that you received.
To edit the received message
1. Start Outlook 2010
2. Go to Inbox and double click the message that you wish to edit.
3. Select Edit Message from the Action dropdown in the Move Section of the Message Ribbon.
4. Change the Subject and message body and click the Save button / icon
It is not possible to edit the email recipients with this approach.