CRM migration
Field-level mapping, validation, and rollback between Lead Guerrilla and Mailchimp. We move data and schema; workflows are rebuilt natively in Mailchimp.
Lead Guerrilla
Source
Mailchimp
Destination
Compatibility
5 of 10
objects map 1:1 between Lead Guerrilla and Mailchimp.
Complexity
BStandard
Timeline
4-6 weeks
Overview
Moving from Lead Guerrilla to Mailchimp is primarily a contact data migration with a substantial manual export component. Lead Guerrilla does not publish a REST API or developer documentation, so all source data must be extracted via CSV exports from the admin UI, screen captures of automation rules, and structured data collection from 1CRM Systems Corp support. We map Lead Guerrilla Contacts to Mailchimp Members, preserving lead scoring values as merge fields and activity history as a best-effort note migration. Lead Guerrilla's Campaigns map to Mailchimp Campaigns and Audiences, Segments map to Mailchimp Segments, and Tags migrate directly. Marketing automation rules, landing pages, and embedded web forms do not migrate — we deliver structured inventories for the customer's team to rebuild in Mailchimp. The tight coupling between Lead Guerrilla and 1CRM introduces cross-reference risks that we audit and resolve before any data moves to Mailchimp.
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 Lead Guerrilla 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.
Lead Guerrilla
Contact
Mailchimp
Member (Audience)
1:1Lead Guerrilla Contact records map to Mailchimp Members within a target Audience. Standard fields (email, first name, last name, phone, address) map directly to Mailchimp merge fields (EMAIL, FNAME, LNAME, PHONE, ADDRESS). Lead scoring values from Lead Guerrilla migrate as a custom numeric merge field (LEADSCORE) so the customer's team can use it in segmentation rules post-migration. Any custom contact properties export as additional merge fields or are documented for manual entry if Mailchimp's merge field limits are reached.
Lead Guerrilla
Company
Mailchimp
Member (company field) or Tag
1:manyLead Guerrilla Companies do not have a direct Mailchimp equivalent because Mailchimp has no native Account or Company object. We extract the Company name and store it in Mailchimp's COMPANY merge field on each related Member. If the customer requires company-level reporting in Mailchimp, we add a tag for each unique company name (format: Company: [Name]) and document this as a Mailchimp tag-based segmentation strategy the customer can use to group members by organization.
Lead Guerrilla
Campaign
Mailchimp
Campaign + Audience
1:1Lead Guerrilla Campaigns map to Mailchimp Campaigns created within the target Audience. We export campaign configuration including channel assignments (email, SMS), timing rules, and enrollment triggers. Note that only email campaigns migrate as standard Mailchimp Campaigns; SMS campaigns require Mailchimp's SMS add-on and are documented separately with SMS-specific setup requirements. Twitter and web notification channels used in Lead Guerrilla have no Mailchimp equivalents and are flagged in the campaign inventory for the customer's team to evaluate.
Lead Guerrilla
Segment
Mailchimp
Segment
1:1Lead Guerrilla Segments (groups of contacts filtered by form source, behavior, or demographic criteria) map to Mailchimp Segments. We export segment filter conditions and member counts, then rebuild them in Mailchimp using Mailchimp's segment builder syntax. Segment membership is translated dynamically rather than as a static list — if the Lead Guerrilla segment used a date-based filter (contacts added after January 1), we replicate the same logic in Mailchimp rather than exporting a snapshot member list.
Lead Guerrilla
Tag
Mailchimp
Tag
1:1Lead Guerrilla tags applied to Contacts and Companies migrate directly to Mailchimp Tags on each Member. Tag naming conventions are preserved exactly as-is to maintain segment continuity. Mailchimp tags support multiple per Member, matching Lead Guerrilla's tagging model. We export the full tag list and apply it during the Member import phase.
Lead Guerrilla
Lead Scoring
Mailchimp
Merge Field (LEADSCORE)
lossyLead Guerrilla's numeric lead scoring values migrate as a custom Mailchimp merge field named LEADSCORE. Mailchimp does not have native lead scoring, so the raw score is preserved but will not update automatically. We document the original scoring model (point values per action, thresholds) in the handoff playbook so the customer's team can either manually update scores or implement a third-party scoring tool like Databox or a custom Zapier/Make integration that updates LEADSCORE based on Mailchimp activity events.
Lead Guerrilla
Activities (email opens, clicks, form submissions)
Mailchimp
Activity (tracked) or Notes
1:manyLead Guerrilla activity history (email opens, clicks, page visits, form submissions) does not map cleanly to Mailchimp because Mailchimp tracks its own engagement activity on emails it sends rather than on historical imports. We perform a best-effort migration of recent high-value activities (last 90 days of email engagement, form submission records) as Notes attached to each Member. Older activity history and web tracking data are documented in an activity export CSV for the customer's reference but are not individually imported as Member records in Mailchimp due to Mailchimp's activity model.
Lead Guerrilla
Landing Page
Mailchimp
Mailchimp Landing Page (rebuild required)
lossyLead Guerrilla Landing Pages cannot be exported as portable HTML or schema files. We export page metadata (title, URL slug, published status), form field definitions, and redirect rules as a structured document. The customer's team must rebuild landing pages in Mailchimp's Landing Page builder (included in Standard tier and above) or in their preferred landing page tool. We provide a field-level mapping so the rebuild is guided rather than ad hoc.
Lead Guerrilla
Web Form
Mailchimp
Mailchimp Form (rebuild required)
lossyLead Guerrilla embedded web forms collect contact data and trigger enrollment actions. We export form field definitions, submission mappings, and redirect behavior. Form logic (field visibility conditions, required field rules, submission triggers) is documented in the automation playbook. Mailchimp Forms (available in all tiers) are the rebuild target. We map each Lead Guerrilla form field to its Mailchimp Form equivalent so the rebuild is a guided copy, not a blank start.
Lead Guerrilla
Marketing Automation Rules
Mailchimp
Customer Journeys (rebuild required)
1:1Lead Guerrilla's automation engine defines when emails fire, when contacts enroll or unenroll from campaigns, and what score adjustments occur on specific actions. There is no export path for this logic. We cannot migrate automation rules automatically. During discovery we capture screenshots and configuration notes for every active automation via the admin UI, then deliver a detailed Customer Journeys playbook mapping each Lead Guerrilla trigger, condition, and action to its Mailchimp Customer Journeys equivalent. The customer's marketing team rebuilds the automations post-migration using our playbook as the specification.
| Lead Guerrilla | Mailchimp | Compatibility | |
|---|---|---|---|
| Contact | Member (Audience)1:1 | Fully supported | |
| Company | Member (company field) or Tag1:many | Fully supported | |
| Campaign | Campaign + Audience1:1 | Fully supported | |
| Segment | Segment1:1 | Fully supported | |
| Tag | Tag1:1 | Fully supported | |
| Lead Scoring | Merge Field (LEADSCORE)lossy | Mapping required | |
| Activities (email opens, clicks, form submissions) | Activity (tracked) or Notes1:many | Fully supported | |
| Landing Page | Mailchimp Landing Page (rebuild required)lossy | Fully supported | |
| Web Form | Mailchimp Form (rebuild required)lossy | Fully supported | |
| Marketing Automation Rules | Customer Journeys (rebuild required)1:1 | Not 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.
Lead Guerrilla gotchas
No documented API for bulk data export
Marketing automation rules are not exportable
Tight 1CRM coupling creates migration blast radius
Overage billing model creates migration cost surprises
Landing page and form assets require rebuild at destination
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
Discovery and export planning
We audit the Lead Guerrilla portal via the admin UI, cataloguing Contacts, Companies, Campaigns, Segments, Tags, and Landing Page count. We identify every active marketing automation rule and document it via screenshots and configuration notes. We assess the customer's Mailchimp target Audience structure (existing audience vs new audience, subdomain for sending domain authentication) and confirm Mailchimp plan tier. We produce a written export plan that sequences the CSV exports by object, assigns a named Lead Guerrilla admin contact for each export, and establishes a timeline for the staged export window before any Mailchimp-side work begins.
Mailchimp audience and field setup
We configure the Mailchimp destination audience including merge fields for COMPANY, LEADSCORE, and any custom Lead Guerrilla contact properties that exceed Mailchimp's standard field set. We create Tags for company-based segmentation if the customer has a company-centric reporting requirement. We configure domain authentication (SPF, DKIM) and verify the sending domain to protect deliverability during the cutover. We set up initial Segments in Mailchimp that mirror the Lead Guerrilla Segment definitions so the segmentation structure is ready for the contact import.
Lead Guerrilla staged CSV export
We coordinate with the customer's Lead Guerrilla admin to perform the staged export. Contacts export via the admin UI contact list in paginated CSV format. Companies export separately. Campaigns and their configuration are documented via screenshots and exported configuration data where available. Segments are exported as member lists. Tags are extracted as a flat CSV mapping contact email to tag name. All exports are validated for row counts, field completeness, and encoding issues before transfer to FlitStack AI's secure migration environment.
Data transformation and Mailchimp import
We transform the exported CSV data into Mailchimp-compatible import format. Contacts map to Members with merge field population. COMPANY merge fields populate from the related Company name. LEADSCORE merge fields carry the numeric lead score value. Tags are applied per-member from the tag export. We run the import in batches using Mailchimp's API with rate-limit handling and exponential backoff. Duplicate detection uses email as the primary key. Each batch emits a reconciliation report (rows in, rows created, rows updated, rows skipped with reason) for the customer's review.
Campaign and segment recreation in Mailchimp
We create Mailchimp Campaigns within the target Audience using the exported campaign configuration as the specification. Timing, subject line, sender profile, and content links are carried forward. We rebuild Mailchimp Segments using the segment filter builder to replicate the Lead Guerrilla segment logic dynamically. We document the Customer Journeys rebuild playbook mapping each Lead Guerrilla automation trigger and action to its Mailchimp equivalent, with step-by-step builder instructions for the customer's marketing team to execute post-migration.
Cutover, validation, and handoff
We freeze writes in Lead Guerrilla during the cutover window, run a final delta import for any contacts added or modified since the initial export, and verify the Mailchimp audience member count matches the reconciled Lead Guerrilla contact total. We deliver the landing page and form inventory with field-level mapping, the automation rebuild playbook, and a CSV of any Lead Guerrilla records that could not be migrated with reason codes. We support a one-week hypercare window for reconciliation issues. We do not rebuild landing pages, forms, or automations inside the migration scope; those are guided handoffs for the customer's team.
Platform deep dives
Lead Guerrilla
Source
Strengths
Weaknesses
Mailchimp
Destination
Strengths
Weaknesses
Complexity grading
Standard CRM migration. 3 of 8 objects need a mapping; the rest are 1:1.
Overall complexity
Standard migration
Derived from compatibility, mapping clarity, API constraints, and data volume across Lead Guerrilla and Mailchimp.
Object compatibility
3 of 8 objects need a mapping; the rest are 1:1.
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
Lead Guerrilla: Not publicly documented.
Data volume sensitivity
Lead Guerrilla 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
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FAQ
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