Log into the Archive Manager Administration Site.
Click "Data Loaders" in the navigation tree
Click the Edit icon next to the JR dataloader
Click the "Active" checkbox
Open the Services Management Console
Restart the "Archive Manager Data Loader Service"
The JR Data loader service will start to process Journal reports from the time it stopped processing them, or from the beginning if Journal Reports have never been linked to mailboxes. This can be a time consuming process, and may take a substantial amount of time to complete.