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Backup of Exchange 2007 Mailboxes - Prior to decommissioning

K B asked
Last Modified: 2015-04-27
We have a client with approximately 1000 mailboxes on our Exchange 2007 server.
They have just completed a migration of said mailboxes to Office 365.
They would like a backup of what we currently have on our Exchange 2007 server.

Q: They would like me to recommend a method for the backup and how they will be able to recover a mailbox in the future (should they need it).

What should I recommend?

I am familiar with using Powershell to Export mailboxes in bulk to a PST (in fact I tested it on 10 mailboxes and it does work fine).
But it seems a tad slow.
Is there something better than that?

Thank you for your time.

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