This is an example of creating and enabling a global journalling on Exchange 2007 or SBS 2008

Create a new Storage Group and Database

Open Exchange Management Console (EMC)

Server Configuration > [Server Name] > New Storage Group
Specify Storage Group name and file path and click New.

EMC > Server Configuration > [Server Name] > Journaling Storage Group > New Mailbox Database
Specify Database name and file path and click New.

Create and secure a new user

EMC > Recipient Configuration > Mailbox > New Mailbox

Create a new user mailbox and place it into newly created Journaling Database.

Select your new Journaling account and click on Properties

General Tab > Select "Hide from Exchange address lists"
Mail Flow Settings Tab > Message Delivery Restrictions > Accept messages from > Only senders in the following list
Add "Microsoft Exchange"
Select "Require that all senders are authenticated"

Enable Journaling globally

EMC > Organisation Configuration > Hub Transport > New Journal Rule
Enter a name for the Journaling Rule and select "Global - All Messages"

MS Exchange 2007
MS Small Business Server 2008