Update to permit the caching of incoming SMTP messages as IPM.Note (817809)

SUMMARY

When you send Simple Mail Transfer Protocol (SMTP) mail (mail that is not from a MAPI source) to a Microsoft Exchange 2000 Server or a Microsoft Exchange Server 2003 server public folder, the message class is IPM.Post. In Microsoft Exchange Server 5.5, the message class of a message that is sent to a public folder is IPM.Note. Because of this, if you have a message archiving system where the e-mail messages must be completely stored and not changed or converted, you may not be able to archive messages from the public folder. This article describes an update that you can use to configure the setting of the PR_MESSAGE_CLASS attribute of SMTP messages that are sent to public folders to IPM.Note instead of IPM.Post.

For detailed information about how to have incoming SMTP messages that are bound for public folders marked as IPM.Note in Exchange 2000 Server, see the following Microsoft Knowledge Base (KB) article:

830961 Embedded e-mail messages appear as IPM.Post after you configure incoming SMTP messages as IPM.Note in Exchange 2000 Server

Note The hotfix for the issue that is described in KB article 830961 is provided in KB article 827555.

MORE INFORMATION

Exchange 2000 Server

Update information

To resolve this issue in Exchange 2000, obtain the hotfix that is described in the following Microsoft Knowledge Base article:

827555 An incorrect number of unread items may be displayed for public folders in Exchange 2000 Server Service Pack 3

Prerequisites

Because of file dependencies, the hotfix that is described in Knowledge Base 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

Exchange Server 2003

To resolve this issue in Exchange 2003, install Exchange Server 2003 Service Pack 1 (SP1). To obtain Exchange Server 2003 SP1, visit the following Microsoft Web site:

http://www.microsoft.com/exchange/downloads/2003/sp1.asp

Configuring the new setting

The following information applies to both Exchange 2000 and Exchange 2003.
Warning If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.After you install this update, incoming messages to public folders can have their message class changed to IPM.Note instead of IPM.Post. You can configure this new setting by creating the Incoming registry value in the following registry subkey:

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\MSExchangeIS\<ServerName>\Public-<GUID>

Value name: Incoming defaults to IPM.Note
Value type: DWORD
Value data: 0 or 1 0 (zero) is default (0=false).

The default behavior without the registry key is that incoming messages appear as IPM.Post. If you set the registry key with a value of 0 (zero), the result behavior is the same as the default behavior, and incoming messages appear as IPM.Post. If you set the registry key with a value of 1 (one), the behavior changes, and new SMTP mail messages from a non-MAPI source appear as IPM.Note.

Important To enable this functionality you must configure these registry settings on all Exchange servers that host public folders. You do not have to configure these registry settings on Exchange servers that do not host public folders. Additionally, you must configure these registry settings for each public folder database on the particular server where you want to enable this functionality.

After you make these registry changes, you must restart the Microsoft Exchange Information Store service to enable this new functionality.