Mass data migration in CRM is the process of transferring large volumes of customer records, historical interactions, and business data between CRM platforms. Companies undergo data migration when upgrading systems, merging databases, or consolidating customer information. A successful migration requires data cleansing, format standardization, and error detection to ensure data integrity. Businesses often use automation tools, ETL (Extract, Transform, Load) processes, and AI-driven mapping to execute seamless transfers. Proper CRM migration strategies prevent data loss, duplication, and inconsistencies, maintaining a high-quality customer database for future operations.