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Event ID: 2019 Source: MSExchangeTransport

The Exchange authentication certificate with thumbprint <thumbprint> must be updated. Run the Enable-ExchangeCertificate <thumbprint> command on this server to update it.
As per Microsoft: "This Warning event indicates that a problem occurred when attempting to validate an internal transport certificate (also referred to as a direct trust certificate) on this computer". See MWEX2K3DB for information.

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