Exchange 2007 to EXchange 2013 Journaling question

Currently working on an exchange 2007 to 2013 migration.
I currently have all 2007 mailboxes journling all email to 1 specific journal mailbox.

my question is, once i migrate a mailbox to 2013 will the email still be journal to the 2007 mailbox or do i need to re-create a new journal mailbox on 2013 ?

and finally does it matter if i migrate the journal mailbox to 2013 if there are still mailboxes on 2007 ? will they still journal ?
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Two types of journaling is (Standard journaling) database level and (Premium journaling) journal rule.
Once you move the mailboxes to exchange 2013 you can move the journal mailbox and then you can configure the journaling on Exchange 2013 database to record message in journal mailbox.

If you move some mailboxes from 2007 to 2013 then the journaling will happen of those mailboxes which are on 2007 server. The journaling will not take place for those mailboxes which are moved to 2013.

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