Microsoft KB Archive/812862

= XADM: Duplicate Messages Are Not Detected When You Use the PR_MESSAGE_SUBMISSION_ID Property to Identify Messages =

Article ID: 812862

Article Last Modified on 2/5/2007

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APPLIES TO


 * Microsoft Exchange Server 5.5 Standard Edition

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SYMPTOMS
When you use the PR_MESSAGE_SUBMISSION_ID MAPI property to uniquely identify messages in your organization, duplicate messages are not detected. The PR_MESSAGE_SUBMISSION_ID attribute is changed between different copies of a duplicate message.



CAUSE
This behavior may occur if message journaling is configured in your organization. It occurs because the PR_MESSAGE_SUBMISSION_ID property is linked to the transport of the message and not to the content of the message.

When messages are forwarded from a recipient's mailbox server to a journal recipient that archives the messages, a new submission identifier (ID) is assigned to the message. Duplicate messages may be stored in the archive if one of the following conditions is true:
 * Multiple mailbox servers forward a copy of the same message to an archive on another server.

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 * Your organization has multiple journal servers.

Each message is assigned a different submission ID for the PR_MESSAGE_SUBMISSION_ID property.



WORKAROUND
To work around this behavior, do not use the PR_MESSAGE_SUBMISSION_ID property to identify duplicate messages. Instead, use the PR_SEARCH_KEY property. PR_SEARCH_KEY is a globally unique property. It is linked to the message content instead of to the transport envelope of each message.



MORE INFORMATION
For additional information about the PR_SEARCH_KEY property, visit the following Microsoft Web site:

http://msdn2.microsoft.com/en-us/library/ms529414.aspx

For additional information about how to configure message journaling, click the following article number to view the article in the Microsoft Knowledge Base:

262122 XIMS: Internet Mail Service Extension Message Journaling

Keywords: kbnofix kbprb kbbug KB812862

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