Migrate from Accelo to Mailchimp

Discovery and contact audit

We audit the Accelo deployment to enumerate all Contacts, Companies, contact tags, custom fields on Contacts and Companies, and the existing Mailchimp integration configuration (if any). We identify sync rules currently in place, contacts filtered by those rules, contacts with multiple Company associations, unsubscribed contacts, and any contacts with malformed email addresses. The discovery output is a written scope document with record counts, field inventory, and a recommended Mailchimp audience architecture (single Audience or multiple Audiences per business unit). This typically takes two to three business days.

Mailchimp Audience and merge field pre-creation

Before any data import, we create the merge fields in the destination Mailchimp Audience that correspond to Accelo's standard fields (FNAME, LNAME, PHONE, MOBILE, POSITION, COMPANYNAME, COMPANYSTATUS, ADDRESS) and every supported Accelo custom field. We configure field types to match (text, number, date, choice). For customers migrating to multiple Audiences, we create the merge field schema in each Audience. Mailchimp's Audience-level field creation is a prerequisite for the subsequent API import; we complete this step before connecting the migration tool to avoid field-not-found errors during import.

Suppression list reconciliation

We export the existing Mailchimp suppression list (unsubscribed, bounced, and cleaned addresses) and cross-reference it against the incoming Accelo contact list. Addresses that appear on the suppression list are flagged and excluded from migration to prevent immediate re-bounce or re-unsubscribe. We deliver a suppression reconciliation report to the customer showing the count of suppressed addresses and recommending whether to run a re-opt-in campaign for any suppressed contacts the customer wishes to re-engage.

Sample migration and field mapping validation

We run a sample migration of 50-100 representative Contacts with varied field combinations (standard fields, custom fields, missing fields, multi-company contacts, contacts with tags) into the Mailchimp Audience. We validate that merge fields populate correctly, tags apply, subscription status sets accurately, and email address validation catches syntax errors. The customer reviews the sample in Mailchimp and approves or requests corrections before the full migration proceeds. Any field mapping adjustments, custom field prioritization, or audience structure changes happen at this stage.

Full migration and tag migration

We run the full contact and company migration into the Mailchimp Audience(s). Contacts import with email as the dedupe key. Accelo tags migrate as Mailchimp tags on each Subscriber record. The Company name and Company status resolve to the COMPANYNAME and COMPANYSTATUS merge fields on each Subscriber. We set the subscription status from the Campaign Communication flag and respect Mailchimp's suppression rules for previously unsubscribed contacts. Each phase emits a row-count reconciliation report comparing Accelo source counts to Mailchimp subscriber counts.

Automation rebuild handoff and go-live

We deliver the automation inventory document listing every active Accelo workflow and the equivalent Mailchimp Customer Journey trigger configuration. We do not rebuild automations as code inside the migration scope; the customer's marketing team uses the inventory to rebuild workflows in Mailchimp's Customer Journeys builder. We enable the Mailchimp Audience as the active contact list and provide a post-migration hygiene guide covering tag management, duplicate review, and suppression list maintenance.