(http://i55.tinypic.com/15g8ri8.jpg)
Outlook 2007/2010 only: The primary function of this add-in is to add a couple of buttons to the Outlook ribbon to prevent people from replying to all the recipients of your message or forwarding it. The add-in uses a facility built into Outlook and Exchange that is more lightweight than information-rights management but is not exposed in the existing UI. The add-in also includes a check for common email errors, such as omitting attachments or subject lines.
(http://i51.tinypic.com/4vfk36.jpg) (http://research.microsoft.com/en-us/downloads/60860f41-88ab-4bb4-8104-765feca9cfed/default.aspx)(http://i53.tinypic.com/6y07r4.jpg) (http://research.microsoft.com/en-us/downloads/60860f41-88ab-4bb4-8104-765feca9cfed/NoReplyAll%20Outlook%20Add-In%20CPT%20EULA%20.txt)
Works with Outlook 2007 and 2010.
To install, unzip to some directory on your PC and run setup.exe.
Visit the project description page (http://research.microsoft.com/en-us/projects/researchdesktop/noreplyall.aspx) for full details about the tool.