List the fields, reports and workflows the new CRM must support. Separate day-one needs from optional improvements.
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Agree the cleanup rule and acceptance test before moving data.
Do not treat every old record as permission to market. Carry forward consent status, source and restrictions.
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Compare record counts and sample important fields. Check relationships, duplicate handling and attachments.
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Decide when the old system becomes read-only. Name the sign-off owner and document how rollback would work.
Build a field-mapping sheet and a sample test set. Read the full migration guide before a production import.