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This paper extends the IS continuance model to improve our understanding of the determinants of E2. 0 post-adoption. Our proposed research model incorporates four constructs into the IS continuance model: firm size, firm scope, subjective norms and competitive pressure based on the TOE framework. Results from a survey of customers of a leading E2. 0 in China supported our model. We find that organizational and environmental context factors including subjective norms and competitive pressure significantly influence enterprises’ intention to renew their E2. 0 service. Perceived usefulness and satisfaction are no longer the strongest predicators of continuance usage in the context of enterprise system.