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With OFBiz as an option a much better question than build vs. buy is: "Build vs. Buy vs. OFBiz." Because of the architecture and techniques used in OFBiz, and because it is open source, you can change any component you need to, or even attach logic in various places without modifying the existing logic. With OFBiz your customization needs can be implemented for even less than if you wrote your entire solution yourself. In other words, if you build the whole solution yourself the 20% of the functionality that is custom to your business will likely require about 20% 80% of the total solution cost. If you use OFBiz and customize it to your needs you will probably be able to implement the same functionality for 25-50% of what it would cost developing it yourself as part of a solution from scratch.

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