CRM migration
Field-level mapping, validation, and rollback between Propeller CRM and Mailchimp. We move data and schema; workflows are rebuilt natively in Mailchimp.
Propeller CRM
Source
Mailchimp
Destination
Compatibility
4 of 8
objects map 1:1 between Propeller CRM and Mailchimp.
Complexity
CModerate
Timeline
2-3 weeks
Overview
Propeller CRM to Mailchimp is a rescue migration from a platform that shut down permanently in December 2019. There is no live API, no admin console, and no support team to contact. Everything we work with comes from the shutdown data export archive that Propeller produced before the February 2020 data-request deadline. Mailchimp is an email service provider (ESP) with a subscriber-centric audience model, not a sales CRM with pipeline management. Contacts and Companies from Propeller map to Mailchimp subscribers, with company affiliation stored as merge fields and tags. Deals, Pipeline Stages, and Owner assignments have no direct Mailchimp equivalent — we preserve these as text notes and tag values on the subscriber record so the customer retains the context. Email Campaigns from Propeller are recreated as historical reference notes and, where contact lists are intact, mapped to Mailchimp audiences. Email Templates migrate as Mailchimp template content. We do not migrate Activity history (opens, clicks, replies, meeting logs) because Propeller's Gmail extension did not expose these in the standard export. Workflows, automations, and sequence cadences do not migrate and are documented separately for the customer's admin to rebuild in Mailchimp's automation builder.
Every standard and custom field arrives verified.
AI proposes the map; you confirm before any record moves.
Parent–child, lookups, and ownership stay linked.
Calls, emails, meetings — with original timestamps.
Documents, uploads, and inline notes move with the record.
Why teams make this switch
Leaving
What's pushing teams away
Choosing
What's pulling them in
Object mapping
Each row shows how a Propeller CRM object lands in Mailchimp, including any object-level transformations, lookup resolution, or schema-design dependencies.
Typical mapping — final map is confirmed during the sample migration step.
Propeller CRM
Contact
Mailchimp
Subscriber (Mailchimp Audience)
1:1Propeller Contact records map directly to Mailchimp subscribers in the destination audience. We preserve first name, last name, email address, phone number, and company name as standard Mailchimp merge fields (FNAME, LNAME, EMAIL, PHONE, COMPANY). Any Propeller custom contact properties migrate as additional merge fields or subscriber tags. Opt-in status is inferred as subscribed for all exported contacts unless the Propeller record explicitly noted an unsubscribed or bounced status, which we carry over as the Mailchimp Subscribed status field.
Propeller CRM
Company
Mailchimp
Subscriber Merge Field + Tags
1:manyMailchimp has no dedicated Company or Account object. Propeller Company records are merged into the Contact migration by company name, with each subscriber receiving a COMPANY merge field carrying the original company name. If a Propeller Company record was linked to multiple Contacts, those contacts receive a matching tag (e.g., 'Company: Acme Corp') so the customer can build Mailchimp segments by company affiliation post-migration. We flag any duplicate company name variations for customer confirmation before encoding.
Propeller CRM
Deal
Mailchimp
Subscriber Tags + Notes Field
lossyMailchimp has no deal or opportunity object. Propeller Deals are preserved as text-encoded tags on the linked subscriber record (e.g., 'Deal: $4,500 Enterprise Q1') and in a MERGE_NOTES or CUSTOM_NOTES merge field carrying deal name, amount, and stage as plain text. The customer should understand that these are reference annotations, not live pipeline records — Mailchimp cannot track deal progress, stage transitions, or owner assignments natively.
Propeller CRM
Pipeline Stage
Mailchimp
Subscriber Tags (text-encoded)
lossyPropeller pipeline stage names (e.g., 'Proposal Sent', 'Awaiting Finance', 'Verbal Yes') have no Mailchimp equivalent. We encode the final stage value as a tag on the associated subscriber (e.g., 'Stage: Proposal Sent') and in the deal reference note. Stage ordering logic from Propeller is not preserved because Mailchimp has no sequence concept for subscriber attributes. Stages requiring manual placement confirmation during scoping are flagged in the mapping document before migration.
Propeller CRM
Email Campaign
Mailchimp
Audience Reference Notes + Campaign Inventory
lossyPropeller Email Campaigns are not directly importable into Mailchimp because Mailchimp campaigns are tied to send operations on its platform. We extract campaign names, associated contact lists (by email address match), send dates, and open/click statistics from the Propeller archive and document them as a written campaign inventory. If the Propeller contact lists are intact and still valid, we recreate them as Mailchimp audiences or static segments so the customer can reference historical send history alongside the new Mailchimp campaign data.
Propeller CRM
Email Template
Mailchimp
Email Template (Mailchimp)
1:1Propeller email templates with merge field names and HTML body content migrate to Mailchimp template format. We extract template subject lines, body HTML, and merge field placeholders from the archive and create Mailchimp Templates via the Mailchimp API. Plain-text variants are preserved if present in the Propeller export. The customer should review templates in Mailchimp's template editor before sending because rendering differences between Propeller's email renderer and Mailchimp's may affect layout.
Propeller CRM
Owner / User
Mailchimp
Subscriber Tags (text-encoded)
1:1Propeller user accounts tied contacts and deals to individual sales reps by email address. Mailchimp subscribers have no owner field. We capture the original owner email as a tag on each subscriber (e.g., 'Owner: [email protected]') and in the deal reference note for contacts with associated deals. If the original Propeller owner email is no longer active, this tag still preserves the attribution context for the customer's admin.
Propeller CRM
Activity (opens, clicks, replies, meetings)
Mailchimp
Not migrated
1:1Propeller's Gmail extension tracked per-contact activity logs (email opens, link clicks, replies, meeting scheduling) as live event data inside the platform. These were not included in the shutdown data export package. We cannot reconstruct the activity timeline from the Propeller archive and do not falsely promise this data as part of the migration. Mailchimp will begin fresh campaign tracking from the date of migration onward.
| Propeller CRM | Mailchimp | Compatibility | |
|---|---|---|---|
| Contact | Subscriber (Mailchimp Audience)1:1 | Fully supported | |
| Company | Subscriber Merge Field + Tags1:many | Fully supported | |
| Deal | Subscriber Tags + Notes Fieldlossy | Fully supported | |
| Pipeline Stage | Subscriber Tags (text-encoded)lossy | Fully supported | |
| Email Campaign | Audience Reference Notes + Campaign Inventorylossy | Fully supported | |
| Email Template | Email Template (Mailchimp)1:1 | Fully supported | |
| Owner / User | Subscriber Tags (text-encoded)1:1 | Fully supported | |
| Activity (opens, clicks, replies, meetings) | Not migrated1:1 | Fully supported |
Gotchas + challenges
Platform-specific issues from each side, plus the pair-specific challenges that don't show up on either platform's page on its own.
Propeller CRM gotchas
Platform shutdown — no active API or support
Activity history not included in standard export
Deal stage mapping requires manual review
Owner/user assignment requires remapping
Mailchimp gotchas
Contact count includes unsubscribed and non-subscribed records
Automation workflows cannot be exported
Account suspensions trigger silently during migration
Template HTML is Mailchimp-specific and may not render in other platforms
E-commerce data requires active store connection
Pair-specific challenges
Migration approach
Archive intake and data audit
We receive the customer's Propeller CRM shutdown archive (typically a CSV export or zipped file set). We audit the archive for record types present, field completeness, row counts per object (Contacts, Companies, Deals, Campaigns, Templates), and the presence of merge fields or custom properties. We flag any objects that are absent from the archive (e.g., if the contact list is missing or the campaign records are empty) and communicate data gaps to the customer before migration begins. If the customer does not have an export file, we confirm whether one was requested from Propeller support before the February 2020 deadline.
Deduplication and data cleaning
We deduplicate the Propeller contact list by email address, keeping the most recent record per address. We validate email addresses for format correctness and flag hard bounces and unsubscribed statuses from the Propeller export for Mailchimp's Suppression List import. We resolve duplicate company name variations (e.g., 'Acme Corp', 'ACME', 'Acme Corporation') by normalizing to a single canonical company name before encoding as merge fields and tags. We remove records that are explicitly marked as deleted or bounced in the Propeller archive.
Object mapping and deal context encoding
We apply the Propeller-to-Mailchimp object mapping: Contacts to Subscribers, Companies to merge fields and tags, Deals to text-encoded tags and notes. We encode pipeline stage values as subscriber tags, owner email assignments as tags, and campaign associations as audience segments or reference notes. We run a test import of 50-100 records into a Mailchimp test audience using the Mailchimp API to validate field mapping, merge field compatibility, and tag format before committing to a full load.
Template extraction and Mailchimp template creation
We extract all Propeller email templates from the archive, including HTML body, subject line, and merge field names. We translate Propeller merge field placeholders to Mailchimp merge tag syntax (e.g., *|FNAME|* becomes {{FNAME}} in Mailchimp's template variable format). We create Mailchimp Templates via the Mailchimp API using the extracted HTML and confirm the template renders correctly in Mailchimp's editor. The customer reviews and approves all templates before they are set as active.
Full audience import and suppression list upload
We run the full contact import into the production Mailchimp audience via the Mailchimp API with batch chunking (up to 500 subscribers per batch per Mailchimp's current API limits) and exponential backoff on rate limit responses. We upload the suppression list (hard bounces, unsubscribes) from the Propeller archive to ensure these contacts do not receive re-import as active subscribers. We generate a row-count reconciliation report comparing Propeller contact totals against Mailchimp subscriber totals and flag any records that failed to import.
Cutover, campaign inventory delivery, and template handoff
We deliver the written campaign inventory documenting all Propeller Email Campaigns (names, send dates, associated contact lists, and open/click metrics from the archive) as a reference document. We deliver the template handoff with all Propeller templates recreated in Mailchimp. We provide a brief written inventory of Propeller workflow and automation patterns for the customer to rebuild in Mailchimp Customer Journeys. We do not rebuild automations as code; that work is an admin task or a separate engagement. We support a five-business-day post-migration window for reconciliation issues raised from the imported audience.
Platform deep dives
Propeller CRM
Source
Strengths
Weaknesses
Mailchimp
Destination
Strengths
Weaknesses
Complexity grading
Moderate CRM migration. 1 of 8 objects need a manual workaround.
Overall complexity
Moderate migration
Derived from compatibility, mapping clarity, API constraints, and data volume across Propeller CRM and Mailchimp.
Object compatibility
1 of 8 objects need a manual workaround.
Field mapping clarity
Field mapping is derived from defaults — final spec confirmed during the sample migration.
Timeline complexity
8-object category — typical timelines run 2–7 days end-to-end.
API constraints
Propeller CRM: Not applicable — platform shut down December 15, 2019.
Data volume sensitivity
Propeller CRM doesn't expose a bulk API — REST + parallelization used for high-volume runs.
Estimator
Rule-based pricing — no per-record fees, no manual quotes. Migrations over 2M records are scoped individually.
Step 1
Pick a category, then your source and destination platforms.
Category
FAQ
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