Easiest way is to export to PST and import into the archive.
it's not possible. you wouldnt want to do it because mailbox data is completely different from journal data. what you could do instead is create a mailbox archiving task and archive without deleting the original and without creating shortcuts.
Maybe if we better understood what you need to do. In my case, I am exporting all my user archived email from the user archives prior to when we enabled journaling (2 years worth) and importing this into a shared archive in the Journal Vault store so that I can retain the data for eDiscovery after we migrate/delete the user archives.
What is your use case?
