That doesn't sound like an issue related to a custom form, because a form would show its content in the open message. I'd suggest that you explore specifics in the microsoft.public.outlook.general forum.
"Always Upside" <Always Upside@discussions.microsoft.com> wrote in message news:B94D1D57-7DDB-4872-9287-1BEDBBF7DE85@microsoft.com...
> Sue -
>
> I see multiple posts about Outlook 2007 users on Vista, not being able to
> read messages in the Reading Pane or even when opening the message (typically
> when HTML content is included).
>
> Is this a confirmed problem? Workarounds? bug fixes? makes the use of
> Outlook extremely cumbersome, for some business users that receive 200 or
> more emails per day
>
> "Sue Mosher [MVP-Outlook]" wrote:
>
>> If Outlook 2007 is your platform, then the solution is to use form regions, a new feature in that version, not published custom forms. My book provides a very basic introduction to form regions, which are also covered in the Outlook Developer Reference on MSDN. They need to be implemented with an add-in if they have any kind of complex functionality; the recent books by Randy Byrne and Ken Slovak cover such add-ins.
>>
>> However, without details about what your application is trying to do, it's impossible to say whether a form region would be a workable solution.
>>
>> "Microsoft does not support" means that you create such solutions at your own risk. If it doesn't work, Microsoft won't help you fix it.