The event message as it appears in the NT Eventlog. This is a standard message with zero or more insertion strings supplied ...

The event message as it appears in the NT Eventlog. This is a standard message with zero or more insertion strings supplied by the source of the NT event. The insertion strings are inserted into the standard message in a predefined format. If there are no insertion strings or there is a problem inserting the insertion strings, only the standard message will be present in this field.