Ingestion to versions of Exchange 2010 SP 1 or earlier can be done by using EWS only. This means that the ingest provider order, on the System Configuration page, should be updated to show just EWS.
In order to support this feature, the service account that is being used to ingest the data must be granted an additional role within Exchange.An example of the PowerShell command that can be used to grant this extra permission is shown below:
[PS] C:\>New-ManagementRoleAssignment -Name:VaultAdminImpersonization -Role:ApplicationImpersonation -User: ADomain\TheUser

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