I want to disable the Reply All function in Outlook 2007/2010 running against an Exchange 2003 server. In place of it I want to create two buttons - Reply-to-all-internal and a Reply-to-all-internal-and-external. If a user received an e-mail with various to's and cc's that included some internal e-mail domain users and others external and they wanted to reply only to the internal users on the original e-mail they would choose the 'Reply-to-all-internal' button. If they actually wanted to reply to all in the original e-mail they received - regardless if they were internal and external correspondents - they would choose the 'Reply-to-all-internal-and-external ' button. How would I go about doing this? I am open to third-party applications, VB code, macros, etc.