A contact user cannot use a custom contact form after a contact item is replicated to other public stores in Exchange Server 2007

In a public folder on a server that is running Microsoft Exchange Server 2007, you create a contact item that uses a custom contact form. However, when the contact item is replicated to other public stores, the contact user cannot use the custom contact form.

This problem occurs because the custom PR_MESSAGE_CLASS property of the contact item is overwritten by the IPM.Contact class when the contact item is replicated to other public stores.

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.