The 2nd generation of mobile applications (apps) based on Smartphone's and tablet PCs are completely changing the way mobile software is developed, distributed and consumed. In particular mobile enterprise applications (MEA) have a disruptive effect on existing enterprise software and require rethinking in the software industry. Despite their impact, MEA have not been considered sufficiently in literature. This paper contributes to fill this gap by investigating more than 500 existing MEA, by providing an overview of typical characteristics of MEA, and extracting of both future directions in the MEA market and a related research agenda.