Requirements
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The service account must be a member of the Local Administrator Group on the access node servers.
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The service account must have a mailbox.
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For public folders, service account should have owner permission at the root level (all public folder).
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For public folder backup and restore, the service account must have impersonation and view-only permissions.
Note
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You do not need Microsoft Outlook for mailbox backups in Exchange Web Services (EWS).
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You will need Microsoft Outlook (any 64-bit version) for PST/MSG restores.