This research intends to understand the impact of a strategic innovation on microfirm busi-ness model, and to analyse the organizational and strategic impacts of the changes created by such an innovation. Our research is based on Business Model approach (Johnson, Chris-tensen, & Kagermannand, 2008), which recently proved its conceptual efficiency in strate-gic analysis. The survey is based on single case study about a French microfirm which is specialised in local economic news and legal advertisement. The results show that the com-pany has reinvented his business model using IT and change the competition rules in the sector. Second, we highlight the difficulties encountered by the firm to implement IT. This conducts us to think about the double dimension innovation – adaptation of the business model in microfirm context due to the specificity of microfirm market. We also develop a discussion on the management of change.