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Event ID: 11202 Source: MSExchangePOP3

Logon attempt from to has failed: HrLookupCredentials() call failed with error: A required privilege is not held by the client.
As per Microsoft: "This problem occurs when the Microsoft Exchange Server service account does not have the <Act as part of the operating system> Windows NT user right. This only happens if the client tries to use basic (clear text) authentication". See ME171435 and ME173776 for more details.

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