The properties that are listed in the Interaction History | partitions | partition[n] | configuration category specify the minimum value for a response that must be included in reports. You can also specify the data of records that must be imported from Campaign, Interact, and eMessage.
The Start date for initial ETL (MM-DD-YYYY) property sets the earliest date of records to be imported. It applies only to the first import of data from Campaign, Interact, and eMessage.