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Microsoft Exchange Shell Permissions for a Mailbox Backup

If you are getting an error creating a Mailbox backup set then you will need to give the main Mailbox full permissions to all the Mailboxes.

Open up Microsoft Exchange Shell & run these commands to allow full access to all the mailboxes:

Set-User "%mailboxname%" -RemotePowerShellEnabled $True

Get-Mailbox | Add-MailboxPermission -User "%mailboxname%" -AccessRights FullAccess