Every enterprise today knows what open source is all about. They also understand the broader value proportion that is can offer. But, when it comes to adoption of open source products, either free or commercial, the major pull comes from the cost reduction generally associated with it. One important advantage this is generally overlooked is the feasibility and ease of integration with other applications and customization.
Integration and customization, however, is not limited to just open source software. Some proprietary format/protocol based products address the integration aspect by providing web service APIs. Such integration is limited by the extent of access to data/functionality provided by the vendor. With open source and open standards based products on the other hand, there is virtually unlimited scope for integration and customization.