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In order to migrate attachments from Salesforce to Dynamics CRM, we could use Kingswaysoft without writing any code through the Developer version.
Kingswaysoft has a premium Derived column tool available that decodes the Attachment encoded string from Salesforce.com and migrates it to Dynamics 365. The license needs to be obtained only to use the SSIS package in production as a scheduled job or through the command line tool.
The process is explained as below:
Voila! You’ve migrated your Salesforce.com attachments Dynamics 365!
Happy Dynamics 365’ing!