With Adobe Experience Platform, you can share data between Campaign Classic and Adobe Real-time Customer Data Platform (RTCDP). This allows you to target Adobe Experience Platform audiences in your Campaign workflows, then send back to Adobe Real-time Customer Data Platform data related to these audiences like sends, opens, and clicks.
Learn how to work with Adobe Experience Platform Sources and Destinations to share data between Campaign Classic and Adobe Real-time Customer Data Platform through this detailed documentation: Get started with Sources and Destinations
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In case you have any ideas and/or suggestions regarding the Campaign Classic product, then kindly submit them here.