If you've not heard of Cazoomi SyncApps®, it's a pretty impressive cloud application that synchronizes your contact data across financial, ecommerce, email service providers and/or customer relationship management systems. For enterprise customers, the Cazoomi application is much less expensive than the development necessary. And you need not worry about companies updating their integrations… Cazoomi has to!
Aside from the terrible video :), Cazoomi appears to be a very strong, proven platform. And it's imperative that your subscriber data remain up to date across platforms. Sending a message out your CRM when a subscriber has opted out… or vice versa can cost your company a customer or even violate CAN-SPAM regulations. And it's imperative that your marketing lists keep up to date with your contact databases.