1. Set up a journaling mailbox (i.e. call it something like "JournalMB1@yourcompany.com).
2. Launch Exchange System Manager on each store and set the "archive all messages on this store" value to the journaling mailbox. A copy of all messages Exchange in your organization will be archived to the journaling mailbox.
3. Backup the Journaling mailbox to make sure you can recover data in case of disaster.
This was first published in October 2004