and the value data 1 (one), when you send a Simple Mail Transfer Protocol (SMTP) e-mail message to a public folder by using Microsoft Outlook Express or another non-MAPI e-mail client, if the SMTP e-mail message contains one or more embedded e-mail messages, those embedded e-mail messages appear with a message class of IPM.Post instead of IPM.Note.
This problem occurs because of the behavior of the default message class feature in Microsoft Exchange 2000 Server. In this scenario, the incoming embedded e-mail message does not have a message class. Therefore, the MIME decoding does not set the message class property. Therefore, the embedded message receives the default message class of IPM.Post that is used for all the messages in the public store.
For additional information about how to configure Exchange 2000 Server to permit SMTP messages to be cached as IPM.Note, click the following article number to view the article in the Microsoft Knowledge Base:
817809 Update to permit the caching of incoming SMTP messages as IPM.Note
Note The hotfix for the issue that is described in Microsoft Knowledge Base (KB) article 817809 is provided in KB article 827555.
To resolve this issue, obtain the hotfix that is provided in the following KB article:
827555 An incorrect number of unread items may be displayed for public folders in Exchange 2000 Server Service Pack 3
Because of file dependencies, the hotfix that is described in KB article 827555 requires Exchange 2000 Server Service Pack 3 (SP3) and the August 2004 Exchange 2000 Server Post-Service Pack 3 Update Rollup. For additional information, click the following article numbers to view the articles in the Microsoft Knowledge Base:
301378 How to obtain the latest Exchange 2000 Server service pack
870540 Availability of the August 2004 Exchange 2000 Server Post-Service Pack 3 Update Rollup
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.