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Exchange public folder messages converting from ipm.note to ipm.post

Until a couple of weeks ago, when a mail message came in for a public folder, it would come in as ipm.note. But now, for some reason, it is converting to ipm.post. How can I stop this?
Great question! While I can't answer what the root cause was behind the change in your environment (possibly a service pack?), I can provide a way to resolve this -- assuming you're running Exchange 2000 or Exchange 2003.

If you're on Exchange 2000, you'll need to get a copy of the April 2004 Exchange 2000 Server post-Service Pack 3 update rollup (Microsoft Knowledge Base Article: 836488, April 2004 Exchange 2000 Server post-Service Pack 3 update rollup) and install it on your Exchange server(s).

If you're on Exchange Server 2003, you'll need to call Microsoft Product Support Services (PSS) and ask for fix 817809.

Once hotfixed, you'll want to a DWORD registry key named "incoming defaults to IPM.Note" under the following registry key:


\Public-<GUID> and set it to "1" to retain 
the IPM.Note message class.

This is also detailed in my colleague Serdar Yegulalp's article, Public folder message classes.

Do you have comments on this Ask the Expert Q&A? Let us know.
Related information from SearchExchange.com:

  • Learning Center: A primer on Exchange public folders
  • Reference Center: Public folder management

  • Dig Deeper on Exchange Server setup and troubleshooting

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