This paper investigates the roles of institutional isomorphic mechanism in Information Infrastructure (II) implementation. It explores a type of cloud computing namely; Infrastructure as a Service in the context of its national government implementation in Oman. The research answers the following research question; how institutional isomorphic mechanisms impact the Cloud Computing Implementation? The findings revealed that institutional isomorphic mechanisms played a major role in the implementation of government Cloud Computing project in Oman and in particular the Coercive and mimetic mechanisms. Practical and theoretical implications of the findings are then discussed.