Companies moving to Office 365 must decide what they should do with their on-premise compliance journals. The issue is Office 365 does not allow for journal mailboxes, so many companies have created workarounds. They include: Utilizing shared mailboxes for journal data Exploding legacy journals so they can migrate the journaled individual emails into the associated custodian mailboxes Keeping your on-premise Exchange server active is expensive. Using a proprietary third-party cloud is also expensive and risks the issue of vendor lock-in, otherwise known as data prison.
If you’re moving a legacy email archive to Office 365, chances are good that you also have Exchange journal data to move as well. If you do, it’s likely that the total amount of journal data is equal to or greater than the total size of your email archive. With regards to Office 365, you might be wondering where the journal data is stored. It comes down to two possibilities; move the journal into the Personal Archive of an Office 365 active mailbox, or create separate Office 365 mailboxes (e.g. Journal Mail 001, Journal Mail 002, Journal Mail 003) and move the journal data for groups of custodians into those. This practice is called "journal splitting”. To many, an unknown concept that raises many questions, the most important being; is journal splitting the best practice for your organization’s regulatory or legal needs? The answer is it depends… Let’s break it down so you have all the facts before you make a migration decision on your journal.
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