The custom message class of contact object is overwritten by the normal IPM.Contact class when an Exchange 2007 server replicates the contact object to any other public store

When a Microsoft Exchange 2007 server replicates a Contact object that is using a custom form, the custom message class is overwritten by the normal IPM.Contact class during content conversion. This issue occurs when a public store is replicated from Exchange 2007 server to any other public store that is hosted on an Exchange 2007 server or on an Exchange 2003 server. As a result, Exchange users cannot use the custom message class of the contact object in the public folders in an Exchange 2007 related environment.

To resolve this problem, install Update Rollup 6 for Exchange 2007 Service Pack 1. For more information about Update Rollup 6 for Exchange Server 2007 Service Pack 1, see the following Exchange Help topic: For more information about how to obtain the latest Exchange service pack or update rollup, see the following Exchange Help topic:

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

Use the Microsoft Exchange Server MAPI Editor (MFCMAPI.exe) tool to check the PR_MESSAGE_CLASS message class. To downloadd the MFCMAPI.exe tool, visit the following Web site:For more information about the PR_MESSAGE_CLASS class, visit the following Web site: