This paper analyses the determinants of ICT adoption in Colombian services firms using micro-level data. It contributes to the scant literature on the determinants of ICT adoption at firm level in emerging economies. Due to ICT heterogeneity, different econometric models are estimated to identify the drivers of ICT adoption. The results show that the factors that positively influence ICT adoption are the proportion of foreign capital, firm age, employees’ education and the ICT spillovers from the corresponding service industry. Information spillovers from the service industry adopters to non-adopters are taken into account as determinants of ICT adoption. An extended version of the model explores the determinants of ICT adoption comparing large firms and SME. For some variables, such as proportion of foreign capital, firm age and employees’ education, the results differ by firm size.