XADM: Message Class Changed during Forward from Public Folder

A public folder is set up with a Folder Assistant rule that specifies that mail be forwarded (with the "Leave message intact" method) to another mailbox or folder. A post with a message class of IPM.Post or IPM.Post.<Custom Name> (where <Custom Name> is a user-defined form name), is changed to IPM.Note when received. This causes the standard message form to be displayed for the message, instead of the Post form (or custom Post form).

A logic error changes the message class for messages that are forwarded with the "Leave message intact" method.

Exchange Server 5.0

A supported fix that corrects this problem is now available from Microsoft, but has not been fully regression-tested and should be applied only to systems experiencing this specific problem. If you are not severely affected by this specific problem, Microsoft recommends that you wait for the next Microsoft Exchange Server version 5.0 service pack that contains this fix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information on support costs, please go to the following address on the World Wide Web: The English version of this fix should have the following file attributes or later:
This fix has been posted to the following Internet location:

Exchange Server 5.5

To resolve this problem, obtain the latest service pack for Exchange Server version 5.5. For more information, please see the following article in the Microsoft Knowledge Base:
The English version of this fix should have the following file attributes or later:

Microsoft has confirmed this to be a problem in Microsoft Exchange Server versions 5.0 and 5.5. This problem was first corrected in Exchange Server 5.5 Service Pack 2.