Most email archiving products for Microsoft Exchange get their messages by reading the journal. Newcomer Mimosa Systems(http://www.mimosasystems.com/) correctly points out that that’s a pity, because:
- The journal is just a place that lists all the incoming and outgoing emails. It loses a lot of context information. So, for example, with this approach, you lose information on the folder the message was in, or movements of a message from folder to folder
- Journaling imposes a big systems overhead
Instead, Mimosa’s approach to recovery/archiving/storage management is to read the Exchange database directly, and continuously. Sounds like a sensible idea.
For information on Exchange journalling, see http://www.microsoft.com/technet/prodtechnol/exchange/2003/library/journaling.mspx.