See
http://www.outlookcode.com/article.aspx?ID=39, under Substitute Default Form.
Don't people send to recipients outside the organization?
"Rudy" <Rudy@discussions.microsoft.com> wrote in message news:240EFEA5-134E-4EE8-ADB8-1907C5E0C582@microsoft.com...
>I was wonerding about this. But most of the people in my organisation are on
> Outlook now. Can you tell me how you can load a custom form when the new mail
> icon in Outlook 2007 is clicked?
>
> "Sue Mosher [MVP-Outlook]" wrote:
>
>> That's a bad idea. Using a published custom form as the default for mail messages means that non-Outlook recipients will get unreadable attachments (unless the server strips all outgoing TNEF/RTF content).
>>
>> "Helmut Loeffler" <helmutl@shekel.org.il> wrote in message news:%235NqvIIxHHA.4736@TK2MSFTNGP05.phx.gbl...
>> > Thanks a lot, that works.
>> > Now, how can I make this form the 'default' when clicking on 'New Message'?
>>