Event ID - 1002

Event Id1002
SourceMSExchangeTransport
DescriptionVirtual Server x.y.z.k: RE Server accepted a connection attempt.
Event InformationAccording to Microsoft:
CAUSE :

This issue can occur if the Exchange Information Store service is not running.
RESOLUTION:
To resolve this issue, start the Exchange Information Store service.
Reference LinksUnable to Deliver the Message Due to a Message Transfer Failure" Non-Delivery Report

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