Consider the following scenario:
You have some public folder databases on Microsoft Exchange Server 2010 servers that are running in an Exchange Server 2010 environment.
One of the public folder databases contains customized contact objects.
This public folder database is replicated to the other public folder databases on the other servers.
In this scenario, the customized contact objects revert to the default form of Contact object on the other servers after the public folder databases are replicated.
This issue occurs because the custom message class of the contact objects incorrectly reinitialized by using the default IPM.Contact class during the replication process.
To resolve this issue, install the following update rollup:
2661854 Description of Update Rollup 2 for Exchange Server 2010 Service Pack 2
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about public folder replication, visit the following Microsoft website:
General information about public folder replicationFor more information, click the following article number to view the article in Microsoft Knowledge Base:
957748 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