Employees' informal learning in the workplace warrants more attention, and such learning could benefit from the latest mobile technologies such as Web 2.0 applications, which have increasingly been utilized and have the potential to enhance learning outcomes. This multiple-case study examined the impact of mobile Web 2.0 applications on informal learning in the workplace by investigating employees' learning experiences with a mobile App to identify new possibilities of informal learning in the workplace. Learning is recorded as being active in the context of mobile Web 2.0. The findings within cases are provided, followed by a discussion of the overall context. Directions for future development are suggested.