Belgian open source application vendor OpenERP has set up its first overseas business office in San Jose, Calif. Traditionally, the company has worked with reseller partners in the United States and 54 other countries worldwide. After four years, though, OpenERP has begun an aggressive expansion. It plans to have 1,000 partners around the world by the end of 2011. OpenERP's apparent success is perhaps due to an unusual business model that rewards partners well, and it offers only one version of the software for both on-premise and Software as a Service delivery.