Migrate from OPEX 365 CRM to Mailchimp

OPEX 365 CRM Contact records map directly to Mailchimp Members within the target audience. We map firstname, lastname, email address, phone, and address fields using Mailchimp's standard merge field schema (FNAME, LNAME, EMAIL, PHONE, ADDRESS). The contact's primary email address serves as the Member identifier and dedupe key. Any Contact without a valid email address is excluded from migration and flagged in the reconciliation report because Mailchimp Members require an email address.

OPEX 365 CRM Account records have no direct Mailchimp equivalent because Mailchimp does not have an Account or Company object. We map Account Name and Industry to Mailchimp Tags on the corresponding Member record, which allows segmentation by company and sector within the audience. If the customer uses Mailchimp Groups, we map Account records to Groups for a more structured hierarchy. This is a flattened representation, not a true parent-child relationship.

OPEX 365 CRM Lifecycle Stage on a Contact migrates as a Mailchimp Tag with the exact stage label as the tag name (for example, Customer, Evangelist, Lead). If the customer requires a structured field, we create a LIFECYCLE merge field on the Mailchimp audience and write the stage label as string data. Tags are preferred because Mailchimp segments and Customer Journeys can trigger on tag presence directly.

OPEX 365 CRM Leads that have an email address migrate to Mailchimp Members in the same way as Contacts. Leads are treated as audience members with their own Tags applied to indicate origin (for example, tag: sourced_from_lead). Lead status and lead score from Dynamics custom fields migrate as Tags or merge fields. Leads without email addresses are excluded.

OPEX 365 CRM custom attributes on the Contact entity migrate as Mailchimp Merge Fields. Mailchimp enforces a 255-character limit on all text merge fields, which is the primary gotcha in this migration direction. We apply a truncation strategy during the transform phase: text fields over 255 characters are cut to 255 characters with a suffix indicator, and we flag every truncated field in the mapping document so the customer knows which data was shortened. Date fields, number fields, and checkbox fields map to Mailchimp date, number, and phone merge field types respectively.

OPEX 365 CRM Cases (incident entities) have no Mailchimp equivalent. Mailchimp tracks subscriber consent and engagement but not support cases, entitlements, or service-level agreements. We do not migrate Cases. We deliver a written inventory of open and closed Cases with their status, priority, subject, and originating Contact reference so the customer can rebuild case management in a dedicated helpdesk tool if needed.

OPEX 365 CRM Opportunities with pipeline stages, probability, close dates, and amounts have no Mailchimp equivalent. Mailchimp does not have an Opportunity, Deal, or pipeline object. We do not migrate Opportunities. We deliver a written pipeline inventory document listing all active Opportunities with their stage, amount, close date, owner, and associated Contact so the customer's sales team can re-enter or rebuild pipeline tracking in their chosen tool.

OPEX 365 CRM ActivityPointer records (emails, calls, meetings, tasks) have no Mailchimp equivalent. Mailchimp does not store historical activity timelines for Members beyond campaign-level engagement metrics (opens, clicks, bounces, unsubscribes). We do not migrate Activities. If the customer requires activity history, a separate CRM migration to a platform like HubSpot or Salesforce is the appropriate path. We flag this limitation explicitly during scoping.

OPEX 365 CRM Notes (annotation entities with base64-encoded attachment content) have no Mailchimp equivalent. Mailchimp stores campaign attachments as Content-type assets within campaigns, not as per-contact attachments. We do not migrate Notes or file attachments. We extract the full annotation set to a structured folder hierarchy in the customer's staging environment and deliver it alongside the migration inventory so the customer can reattach manually or store as a document archive.