Event ID - 12000

Event Id12000
SourceMSExchangeISPublic Store
DescriptionError <error code> occurred while processing message <message id>.
Event InformationCAUSE:
This error indicates that there was a problem converting a message.

To determine the origin, destination, or cause of the error, review the error returned with this message. Save the message as a .msg attachment from a MAPI client. If possible, use a POP or IMAP client to save the message as an .eml file, and then contact Microsoft Product Support Services.
Reference LinksMicrosoft product: Exchange Version: 6.5.6940.0 Event Source: MSExchangeIS Public Store Event ID: 12000

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