Before the release of Microsoft Office Outlook 2007, Outlook forms were the only option for creating a custom UI. In Outlook 2007, you have a new feature called form regions. Form regions are a new way of customizing the Outlook. Form regions are the added feature of the UI in the standard Microsoft Office Outlook 2007. Form regions will add custom functionality they will build a new range of options in the UI for Microsoft Office Outlook 2007.
When you work with standard forms, you can see that all Outlook items have a MessageClass property that determines the type of objects you're working on, for example, contact, appointment, task, email, post, or journal entry. All of the standard forms are stored in the standard forms library. Form regions are the replacement for the standard forms, to display the custom reading pane, and add new pages to Outlook. In form regions, the controls can be bound to the Outlook properties.
Outlook forms bring you a new design...