Victor Ivanidze has written an event sink for Exchange Server 2000/2003 called
With this event sink (a .DLL), you can selectively enable journaling on any group of Exchange mailboxes. You can also opt to journal only incoming or outgoing messages (or both, of course). The author says it works in clustered environments as well.
SelectiveJournaling has to be configured for the mailboxes it'll be journaling when it is installed -- including whether or not ingoing messages, outgoing, or both will be journaled.
To that end, make sure the mailboxes you want journaled exist (and you have the Service Account configured to access said mailboxes) before you set up the event sink.
This is admittedly a bit of a drawback -- if you want to add selective journaling for newly created mailboxes, you have to reinstall the sink. To avoid having to do this, create a group to use as a designator for all such mailboxes, install and configure the sink to use that group, and then place all the mailboxes that are to be journaled into that group.
The version of SelectiveJournaling available for download from the above link is the demo version; it will only journal mailboxes that have the word TEST in the name. The full unrestricted version is $200 for a single server license, with free updates for one year from the day of purchase.
About the author: Serdar Yegulalp is editor of the Windows Power Users Newsletter
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This was first published in August 2005