Fixes the capitals in names, formats phone numbers, removes duplicate and blank rows, which the Excel file leaves to you. On every plan. Email verification, a check against your Salesforce records and dropdowns, and the push, from Starter.
Where does Mailchimp's export fill Last Name and Company, which Salesforce requires?
Last Name comes from Mailchimp's Last Name column; Mailchimp's export has no column for Company, so add one before you import. The checker above counts the rows with Last Name blank.
Where do NOTES, MEMBER_RATING and the other columns go?
Into Description on each lead, labeled like "- Notes: Asked about the annual plan.".
What happens to unsubscribed contacts?
Mailchimp exports include all contacts regardless of subscription status. This template maps the contact fields but doesn't set email opt-out in Salesforce. Filter out unsubscribed rows before importing, or update the Do Not Email field in Salesforce after.