Here is some links about Outlook forms.
Overview of the Forms in Outlook
(1) Overview of forms in Outlook
(2) Tutorial: Creating and distributing custom forms with Outlook
(3) Understanding Custom Fields in Microsoft Outlook
(4) Outlook Forms Step By Step Index
How work with Forms in Outlook
(1) How to: Save a Form in a Forms Library
(2) How Outlook 2007 uses the forms cache and how to troubleshoot forms cache problems
(3) Saving and Publishing Outlook Forms
(4) Customizing New Meeting Request Outlook Form
(5) How to globally change the default forms in Outlook by using the Forms Administrator utility
(6) How to Update Existing Items to Use a New Custom Form
(7) To distribute Microsoft Outlook forms to other users
(8) How to move a custom form to another computer
(9) Microsoft Outlook Custom Forms
(10) How to Use Formulas in a Custom Outlook Form
(11) Changes to custom properties in Outlook
(12) How to work with user-defined fields in solutions in Outlook 2002
(13) How to Display a Web Page in an Outlook Form
(14) Frequently asked questions about custom forms and Outlook solutions
(15) Designing Outlook Forms (Part 1)
