This study uses meta-analytic techniques to review and extend key insights regarding the existing research on organizational IT assimilation. Our analysis of 53 studies shows that organizational support, propagating institutions, extent of coordination, and IT infrastructure sophistication are strongly related to IT assimilation. We also adopt Swanson’s (1994) IT innovation typology to investigate whether the strength of relationships between key factors and IT assimilation depends on innovation type. Our results show that the relationship between three antecedents – environmental pressure, organizational support, and related knowledge – and IT assimilation is moderated by the type of IT innovation under investigation. Building on the findings from our analysis, we discuss implications for research and practice.