After you create the Email Journaling App, you must associate mailboxes with the journal mailbox subclient.
Before You Begin
Create the journal mailbox plan.
Procedure
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In the navigation pane, expand Solutions > Exchange, and then click the Email Journaling App. 
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In the Journal Mailbox area, on the right side of the page, click Add. The Associate journal mailboxes dialog box appears. 
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From the list of available journal mailboxes, select all the required mailboxes. 
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From the Exchange plan list, select journal mailbox plan. 
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Click Save.