We explore the adoption pattern of seven IT innovations to support taskoriented collaboration between group members working asynchronously or synchronously and the impact of two size-related variables, organization size and the size of the internal IT function, on the adoption of these seven IT innovations. IT adoption is viewed as a transition from the state of non-adoption to adoption (adoption status) and then to the extent of accessibility of the IT to organizational end-users (adoption level). Analysis of data collected from one hundred and eighteen U.S. organizations suggests that adoption patterns of the seven IT clusters vary considerably and that size (organization and IT function) is associated with the aggregate adoption status of the ITs investigated. Larger organizations with larger IT functions had adopted more of the ITs than their smaller counterparts. However, when exploring effects of size-related variables on adoption status of individual IT clusters, our findings suggest that size is associated with adoption of only those IT clusters that may require large resource infusions for acquisition, are fairly complex to use, and require substantial technical support. Size was not found to be associated with the adoption level of the majority of individual IT clusters. However, interestingly, at the aggregate level, our results suggest that once adopted, the IT clusters had higher adoption level in smaller organizations than their larger counterparts. Implications of these findings are discussed along with some directions for practice and research