A property of the item called message class determines the form the item uses. This application can help to change the message class for incoming messages from the default to custom one. For example, you create a custom Outlook form with IPM.Note.Sales message class and you need that each message e-mailed to Exchange Sales mailbox will be converted to your custom form immediately after receiving to display information in a Sales custom form. See a good article that describes an Exchange 5.X - based application to support group mailbox functionality: Implementing a Group Mailbox or Public Folder. Using ChangeMessageClass application you can implement the same functionlaity on your Exchange 2000/2003 - based system.

The application is an Exchange store event sink.