Once a lead is converted to a contact in Salesforce, the ActiveCampaign ID and Marketing Activities will carry over to the contact record page in Salesforce.
Tags in ActiveCampaign will also update for the converted contact. This update happens when the sync updates the contact in ActiveCampaign from Salesforce. The “created-from-salesforce-contact” tag will replace the “created-from-salesforce-lead” tag and a new tag of “salesforce-lead-converted-to-contact” tag will be added.