Event ID - 1007

Event Id1007
SourceMSExchangeTransport
Description"A previous instance of the service has been detected. The service will not start until the previous instance is fully removed. Retry starting the service at a later time. The error code is in the data portion of this event. Error description: %1."
Event InformationAccording to Microsoft:
Cause:

A previous database of the service was detected. The service will not start until the previous database is fully removed. Restart the service.
User Action :
At this time, there is no historical information available to help provide assistance on this event. Please monitor event logs for recurrence of this event, and any other events which recur with it. In addition, please make a note of any other behaviors with the product which coincide with this event.
Reference LinksA previous instance of the service has been detected.

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