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With the Internet quickly development, Instant Message System (IMS) has been applied popularly in daily communication, collaboration OA, E-commerce and Enterprise Customer Service. However, the public Instant Message System can not be easily integrated into the existing enterprise system due to the limitation of different messaging protocols and system customer database. In this paper, by analyzing XMPP core protocol and requirement of enterprise-class IMS (EIMS), we design an implementation framework for EIMS by developing Openfire server and integrating custom database. The provided solution based on XMPP has a better security, openness and supports cross-platform, thus it allows enterprises to create their own EIMS that are flexible and scalable and encourage good system architecture since it can integrate web-based IMS into the other company's internal applications and services with minimum effort.