Outlook 2007: Prevent Forwarding of a Message
Contributed by Rob Rogers 
Tagged: Microsoft Outlook Sending a message to someone and you would prefer that they not forward it to someone else? You can prevent the forwarding of your message by following these steps:
1. Open, create, and address the message as you normally would.
2. Click the Office Button.
3. Mouseover Permission and select Do Not Forward.
Note: You need to have the Windows Rights Management Client installed, if you do not, a prompt will appear. Click Yes and you can download and install the client. You will need a .NET Passport to register and download an RM account certificate.
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Vin said on December 16, 2008
the link does not work
Anonymous said on July 17, 2009
this is a stupid tool. Although it allows you not to forward, you can copy the mail and send another mail as attachment
Rajiv Malhan said on November 26, 2010
why is there need to ask for IRM installed, if some one does not have .NET id then this mail will not be opened by him. It sucks…
Hal_B said on November 27, 2010
This would have been a good tool if there was a way to prevent copy/paste as well.