I want to convert some custom Outlook forms for use with Outlook Web Access (OWA). Is there a tool that can automate this conversion?

The OWA Web-form rendering engine can't directly consume or display Outlook custom forms, which are designed for display within the desktop version of Outlook. Nor am I aware of a tool that can automatically convert desktop Outlook custom forms to OWA format. For now, if you want to create custom forms for use with OWA, you'll have to do so from scratch. To find out how, take a look at the Microsoft Developer Network (MSDN) documentation about Exchange Web forms (http://msdn.microsoft.com/library/en-us/e2k3/e2k3/_wforms_developing_web_access.asp).