I admin an exchange 2007 server for about 50 users, I set this server up about four months ago, I turned on journaling about 2-3 months ago. Currently the journaling mailbox has grown to to 29.5 GB in that amount of time. I won't be able to support this growth for too long. I was just wondering if anyone can help me figure out best practice in this situation where data retention is extremely important.

I would look at 3rd party archiving products. Message Journaling is a poor substitute.

Check out: http://www.quest.com/archive-manager/ http://www.symantec.com/business/enterprise-vault There are others also, maybe you should do a POC and evaluateJonas Andersson MCTS: Microsoft Exchange Server 2007/2010 | MCITP: EMA 2007/2010 | MCSE/MCSA Blog: http://www.testlabs.se/blog