What does the Retrospectively Apply do?

A retrospective sync will push mapped data between Salesforce and Mailchimp for all members of the current audience. There is a 'Retrospectively Apply' action for both the Mailchimp to Salesforce and the Salesforce to Mailchimp mapping directions.

Please note:

• It will apply to all records related to the subscriber list, for the direction mapped
• If this retrospective sync is not run, then the new mappings will only apply to Salesforce Leads/Contacts that are subsequently updated or created