E-services are services delivered over the Internet. Such services have different properties and dimensions, e.g. targeting different sectors, being accessible through different channels, or intended for frequent or infrequent use. Throughout this article the authors address e-services from a mobility perspective. They do this by 1) positioning mobile e-services within the research field; 2) reviewing related work on mobile e-services; and 3) presenting and examining existing challenges (both difficulties and opportunities) when combining mobility and e-services. They see mobile e-services as the next generation of internet-based services and discuss important focus areas and future directions, giving extra notion to challenges and opportunities in the areas of acceptance and adoption, availability anytime and anywhere, and co-operation. In turn, these areas potentially set the scene for enhanced e-participation.